681551404 has 12 divisors (see below), whose sum is σ = 1193119200. Its totient is φ = 340660208.

The previous prime is 681551401. The next prime is 681551443. The reversal of 681551404 is 404155186.

681551404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 681551404.

It is not an unprimeable number, because it can be changed into a prime (681551401) 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, 14839 + ... + 39790.

It is an arithmetic number, because the mean of its divisors is an integer number (99426600).

Almost surely, 2^681551404 is an apocalyptic number.

It is an amenable number.

681551404 is a deficient number, since it is larger than the sum of its proper divisors (511567796).

681551404 is a wasteful number, since it uses less digits than its factorization.

681551404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57752 (or 57750 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 681551404 is about 26106.5394872626. The cubic root of 681551404 is about 880.0341773916.

The spelling of 681551404 in words is "six hundred eighty-one million, five hundred fifty-one thousand, four hundred four".