687040768 has 18 divisors (see below), whose sum is σ = 1371398294. Its totient is φ = 343520256.

The previous prime is 687040759. The next prime is 687040807. The reversal of 687040768 is 867040786.

It can be written as a sum of positive squares in only one way, i.e., 370485504 + 316555264 = 19248^2 + 17792^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1341621 + ... + 1342132.

Almost surely, 2^687040768 is an apocalyptic number.

It is an amenable number.

687040768 is a deficient number, since it is larger than the sum of its proper divisors (684357526).

687040768 is an equidigital number, since it uses as much as digits as its factorization.

687040768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2683769 (or 2683755 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 46.

The square root of 687040768 is about 26211.4625307326. The cubic root of 687040768 is about 882.3905250382.

The spelling of 687040768 in words is "six hundred eighty-seven million, forty thousand, seven hundred sixty-eight".