681646752 has 60 divisors (see below), whose sum is σ = 2004711786. Its totient is φ = 227214720.

The previous prime is 681646751. The next prime is 681646759. The reversal of 681646752 is 257646186.

It can be written as a sum of positive squares in only one way, i.e., 512750736 + 168896016 = 22644^2 + 12996^2 .

It is a junction number, because it is equal to n+sod(n) for n = 681646698 and 681646707.

It is not an unprimeable number, because it can be changed into a prime (681646751) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 128899 + ... + 134082.

Almost surely, 2^681646752 is an apocalyptic number.

It is an amenable number.

681646752 is an abundant number, since it is smaller than the sum of its proper divisors (1323065034).

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

681646752 is a wasteful number, since it uses less digits than its factorization.

681646752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263003 (or 262986 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 681646752 is about 26108.3655558903. The cubic root of 681646752 is about 880.0752139569.

The spelling of 681646752 in words is "six hundred eighty-one million, six hundred forty-six thousand, seven hundred fifty-two".