681510944 has 24 divisors (see below), whose sum is σ = 1385008128. Its totient is φ = 329762880.

The previous prime is 681510931. The next prime is 681510961. The reversal of 681510944 is 449015186.

It is a super-2 number, since 2×681510944² = 928914333583542272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 681510898 and 681510907.

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, 342512 + ... + 344495.

It is an arithmetic number, because the mean of its divisors is an integer number (57708672).

Almost surely, 2^681510944 is an apocalyptic number.

It is an amenable number.

681510944 is an abundant number, since it is smaller than the sum of its proper divisors (703497184).

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

681510944 is a wasteful number, since it uses less digits than its factorization.

681510944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687048 (or 687040 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 681510944 is about 26105.7645741319. The cubic root of 681510944 is about 880.0167627661.

The spelling of 681510944 in words is "six hundred eighty-one million, five hundred ten thousand, nine hundred forty-four".