777787

777787, commonly written as 777,787, is a six-digit integer in base-10. It equals seven hundred seventy-seven thousand seven hundred eighty-seven. The digit sequence consists of five copies of the digit 7 and a single 8 in the fifth position.

As a number, 777,787 is odd and not divisible by 2 or 5. The sum of its digits is 43, so it is not divisible by 3 or 9. It is not a palindrome, since its digits read 7-7-7-7-8-7 forward and 7-8-7-7-7-7 backward. The value lies between 777,000 and 778,000.

In mathematics, 777,787 is a six-digit integer with a distinctive pattern of digits, which can be of interest in studies of digit sequences or combinatorics. Its prime factorization is not stated here; quick checks with several small primes up to 61 indicate it is not divisible by those primes, but a full primality test would require more extensive computation.

Beyond pure math, numbers with repeated digits such as this one frequently appear in data sets, identifiers, or examples used in teaching due to their simple structure and easily verifiable properties. They typically do not have intrinsic universal significance, but may serve as convenient test cases or cultural references to the broader class of repdigit-like numbers.

See also: repdigit, 777,777, digit sum, primality testing.