687997504 has 28 divisors (see below), whose sum is σ = 1366154748. Its totient is φ = 343769600.

The previous prime is 687997493. The next prime is 687997553. The reversal of 687997504 is 405799786.

It can be written as a sum of positive squares in 2 ways, for example, as 641102400 + 46895104 = 25320^2 + 6848^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134514 + ... + 139534.

It is an arithmetic number, because the mean of its divisors is an integer number (48791241).

Almost surely, 2^687997504 is an apocalyptic number.

687997504 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

687997504 is a deficient number, since it is larger than the sum of its proper divisors (678157244).

687997504 is a wasteful number, since it uses less digits than its factorization.

687997504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7174 (or 7164 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 55.

The square root of 687997504 is about 26229.7065176109. The cubic root of 687997504 is about 882.7999249138.

The spelling of 687997504 in words is "six hundred eighty-seven million, nine hundred ninety-seven thousand, five hundred four".