681633460 has 12 divisors (see below), whose sum is σ = 1431430308. Its totient is φ = 272653376.

The previous prime is 681633457. The next prime is 681633461. The reversal of 681633460 is 64336186.

It can be written as a sum of positive squares in 2 ways, for example, as 237098404 + 444535056 = 15398^2 + 21084^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681633461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17040817 + ... + 17040856.

It is an arithmetic number, because the mean of its divisors is an integer number (119285859).

Almost surely, 2^681633460 is an apocalyptic number.

It is an amenable number.

681633460 is an abundant number, since it is smaller than the sum of its proper divisors (749796848).

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

681633460 is a wasteful number, since it uses less digits than its factorization.

681633460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34081682 (or 34081680 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 681633460 is about 26108.1110002237. Note that the first 3 decimals coincide. The cubic root of 681633460 is about 880.0694934789.

It can be divided in two parts, 68 and 1633460, that added together give a triangular number (1633528 = T₁₈₀₇).

The spelling of 681633460 in words is "six hundred eighty-one million, six hundred thirty-three thousand, four hundred sixty".