681511936 has 88 divisors (see below), whose sum is σ = 1607730176. Its totient is φ = 282562560.

The previous prime is 681511913. The next prime is 681511949. The reversal of 681511936 is 639115186.

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, 220675 + ... + 223741.

Almost surely, 2^681511936 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681511936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (803865088).

681511936 is an abundant number, since it is smaller than the sum of its proper divisors (926218240).

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

681511936 is a wasteful number, since it uses less digits than its factorization.

681511936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3125 (or 3107 counting only the distinct ones).

The product of its digits is 38880, while the sum is 40.

The square root of 681511936 is about 26105.7835737600. The cubic root of 681511936 is about 880.0171897469.

The spelling of 681511936 in words is "six hundred eighty-one million, five hundred eleven thousand, nine hundred thirty-six".