681682928 has 20 divisors (see below), whose sum is σ = 1339365168. Its totient is φ = 336040320.

The previous prime is 681682927. The next prime is 681682973. The reversal of 681682928 is 829286186.

It is a super-2 number, since 2×681682928² = 929383228653306368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681682921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 298901 + ... + 301172.

Almost surely, 2^681682928 is an apocalyptic number.

It is an amenable number.

681682928 is a deficient number, since it is larger than the sum of its proper divisors (657682240).

681682928 is a wasteful number, since it uses less digits than its factorization.

681682928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600152 (or 600146 counting only the distinct ones).

The product of its digits is 663552, while the sum is 50.

The square root of 681682928 is about 26109.0583514611. The cubic root of 681682928 is about 880.0907826454.

The spelling of 681682928 in words is "six hundred eighty-one million, six hundred eighty-two thousand, nine hundred twenty-eight".