687865944 has 32 divisors (see below), whose sum is σ = 1775139840. Its totient is φ = 221892000.

The previous prime is 687865943. The next prime is 687865957. The reversal of 687865944 is 449568786.

It is a super-2 number, since 2×687865944² = 946319113830022272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687865943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 461532 + ... + 463019.

It is an arithmetic number, because the mean of its divisors is an integer number (55473120).

Almost surely, 2^687865944 is an apocalyptic number.

It is an amenable number.

687865944 is an abundant number, since it is smaller than the sum of its proper divisors (1087273896).

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

687865944 is a wasteful number, since it uses less digits than its factorization.

687865944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924591 (or 924587 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 57.

The square root of 687865944 is about 26227.1985541727. The cubic root of 687865944 is about 882.7436511817.

The spelling of 687865944 in words is "six hundred eighty-seven million, eight hundred sixty-five thousand, nine hundred forty-four".