681717264 has 40 divisors (see below), whose sum is σ = 1853795040. Its totient is φ = 215278848.

The previous prime is 681717259. The next prime is 681717347. The reversal of 681717264 is 462717186.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 372837 + ... + 374660.

It is an arithmetic number, because the mean of its divisors is an integer number (46344876).

Almost surely, 2^681717264 is an apocalyptic number.

It is an amenable number.

681717264 is an abundant number, since it is smaller than the sum of its proper divisors (1172077776).

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

681717264 is a wasteful number, since it uses less digits than its factorization.

681717264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747527 (or 747521 counting only the distinct ones).

The product of its digits is 112896, while the sum is 42.

The square root of 681717264 is about 26109.7158927477. The cubic root of 681717264 is about 880.1055589627.

The spelling of 681717264 in words is "six hundred eighty-one million, seven hundred seventeen thousand, two hundred sixty-four".