681327688 has 32 divisors (see below), whose sum is σ = 1363168800. Its totient is φ = 318307968.

The previous prime is 681327677. The next prime is 681327721. The reversal of 681327688 is 886723186.

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, 19606 + ... + 41797.

It is an arithmetic number, because the mean of its divisors is an integer number (42599025).

Almost surely, 2^681327688 is an apocalyptic number.

It is an amenable number.

681327688 is an abundant number, since it is smaller than the sum of its proper divisors (681841112).

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

681327688 is a wasteful number, since it uses less digits than its factorization.

681327688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61501 (or 61497 counting only the distinct ones).

The product of its digits is 774144, while the sum is 49.

The square root of 681327688 is about 26102.2544620192. The cubic root of 681327688 is about 879.9378778461.

The spelling of 681327688 in words is "six hundred eighty-one million, three hundred twenty-seven thousand, six hundred eighty-eight".