0x61A80

0x61A80 is a hexadecimal literal used in computer science to represent the decimal value 400 000. In the base‑16 numbering system each digit can represent values 0–15, and the prefix “0x” or “0X” denotes that the following string is hexadecimal. The notation 0x61A80 is read as “six‑one‑A‑eight‑zero” and is equivalent to the decimal integer 400,000. Converting from hex to decimal is performed by multiplying each digit by 16 raised to the power of its position: (6×16⁴)+(1×16³)+(10×16²)+(8×16¹)+(0×16⁰).

In practice, the value 0x61A80 frequently appears as a memory address, offset, or constant in low‑level firmware, operating systems, and embedded systems development. For example, an embedded microcontroller might reserve the address range starting at 0x61A80 for a peripheral register block, or a debugger might display the instruction pointer as 0x61A80 when a program is at a particular halt state. The number is also used in boot loader code or BIOS ROMs where specific offsets map to configuration tables.

Because 0x61A80 equals 400,000, it sometimes signals a significant milestone in data structures or in testing scenarios, such as allocating a buffer that holds exactly 400 k rows or counting 400 000 instruction fetches in a loop. The value is thus notable in both educational tutorials on hexadecimal arithmetic and in practical contexts where precise memory positioning is essential.

Standard references for the usage of 0x61A80 include documentation on memory mapping for the ARM Cortex‑M family, the EVM (Ethereum Virtual Machine) gas cost tables where offsets are expressed in hex, and debugging manuals for GNU Disassembler (gdb) that display addresses in hexadecimal.