681406016 has 14 divisors (see below), whose sum is σ = 1352165190. Its totient is φ = 340702976.

The previous prime is 681406007. The next prime is 681406021. The reversal of 681406016 is 610604186.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 650046016 + 31360000 = 25496^2 + 5600^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5323421 + ... + 5323548.

Almost surely, 2^681406016 is an apocalyptic number.

It is an amenable number.

681406016 is a deficient number, since it is larger than the sum of its proper divisors (670759174).

681406016 is a wasteful number, since it uses less digits than its factorization.

681406016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10646981 (or 10646971 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 681406016 is about 26103.7548256951. The cubic root of 681406016 is about 879.9715968794.

The spelling of 681406016 in words is "six hundred eighty-one million, four hundred six thousand, sixteen".