681411904 has 14 divisors (see below), whose sum is σ = 1352176874. Its totient is φ = 340705920.

The previous prime is 681411889. The next prime is 681411917. The reversal of 681411904 is 409114186.

It can be written as a sum of positive squares in only one way, i.e., 443018304 + 238393600 = 21048^2 + 15440^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 681411904.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5323467 + ... + 5323594.

Almost surely, 2^681411904 is an apocalyptic number.

681411904 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

681411904 is a deficient number, since it is larger than the sum of its proper divisors (670764970).

681411904 is a wasteful number, since it uses less digits than its factorization.

681411904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10647073 (or 10647063 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 681411904 is about 26103.8676061614. The cubic root of 681411904 is about 879.9741314710.

Adding to 681411904 its product of nonzero digits (6912), we get a square (681418816 = 26104²).

The spelling of 681411904 in words is "six hundred eighty-one million, four hundred eleven thousand, nine hundred four".