681808788 has 36 divisors (see below), whose sum is σ = 1734049408. Its totient is φ = 225873360.

The previous prime is 681808769. The next prime is 681808819. The reversal of 681808788 is 887808186.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

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 in 11 ways as a sum of consecutive naturals, for example, 52228 + ... + 63963.

Almost surely, 2^681808788 is an apocalyptic number.

It is an amenable number.

681808788 is an abundant number, since it is smaller than the sum of its proper divisors (1052240620).

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

681808788 is a wasteful number, since it uses less digits than its factorization.

681808788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116364 (or 116359 counting only the distinct ones).

The product of its (nonzero) digits is 1376256, while the sum is 54.

The square root of 681808788 is about 26111.4685148116. The cubic root of 681808788 is about 880.1449434118.

The spelling of 681808788 in words is "six hundred eighty-one million, eight hundred eight thousand, seven hundred eighty-eight".