681631304 has 16 divisors (see below), whose sum is σ = 1302173820. Its totient is φ = 334384960.

The previous prime is 681631277. The next prime is 681631309. The reversal of 681631304 is 403136186.

It can be written as a sum of positive squares in 2 ways, for example, as 558376900 + 123254404 = 23630^2 + 11102^2 .

It is not an unprimeable number, because it can be changed into a prime (681631309) 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, 803387 + ... + 804234.

Almost surely, 2^681631304 is an apocalyptic number.

It is an amenable number.

681631304 is a deficient number, since it is larger than the sum of its proper divisors (620542516).

681631304 is a wasteful number, since it uses less digits than its factorization.

681631304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1607680 (or 1607676 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 681631304 is about 26108.0697103405. The cubic root of 681631304 is about 880.0685655942.

The spelling of 681631304 in words is "six hundred eighty-one million, six hundred thirty-one thousand, three hundred four".