687555690 has 32 divisors (see below), whose sum is σ = 1655462016. Its totient is φ = 182756160.

The previous prime is 687555689. The next prime is 687555703. The reversal of 687555690 is 96555786.

687555690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×687555690² = 945465653702752200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27517 + ... + 46176.

It is an arithmetic number, because the mean of its divisors is an integer number (51733188).

Almost surely, 2^687555690 is an apocalyptic number.

687555690 is an abundant number, since it is smaller than the sum of its proper divisors (967906326).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

687555690 is a wasteful number, since it uses less digits than its factorization.

687555690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74014.

The product of its (nonzero) digits is 2268000, while the sum is 51.

The square root of 687555690 is about 26221.2831493808. The cubic root of 687555690 is about 882.6109141091.

The spelling of 687555690 in words is "six hundred eighty-seven million, five hundred fifty-five thousand, six hundred ninety".