681476388 has 12 divisors (see below), whose sum is σ = 1590111600. Its totient is φ = 227158792.

The previous prime is 681476377. The next prime is 681476429. The reversal of 681476388 is 883674186.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 681476388.

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 in 3 ways as a sum of consecutive naturals, for example, 28394838 + ... + 28394861.

It is an arithmetic number, because the mean of its divisors is an integer number (132509300).

Almost surely, 2^681476388 is an apocalyptic number.

It is an amenable number.

681476388 is an abundant number, since it is smaller than the sum of its proper divisors (908635212).

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

681476388 is a wasteful number, since it uses less digits than its factorization.

681476388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56789706 (or 56789704 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 51.

The square root of 681476388 is about 26105.1027195834. The cubic root of 681476388 is about 880.0018887701.

The spelling of 681476388 in words is "six hundred eighty-one million, four hundred seventy-six thousand, three hundred eighty-eight".