68904493836 has 12 divisors (see below), whose sum is σ = 160777152312. Its totient is φ = 22968164608.

The previous prime is 68904493813. The next prime is 68904493877. The reversal of 68904493836 is 63839440986.

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 68904493836.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2871020565 + ... + 2871020588.

It is an arithmetic number, because the mean of its divisors is an integer number (13398096026).

Almost surely, 2^68904493836 is an apocalyptic number.

It is an amenable number.

68904493836 is an abundant number, since it is smaller than the sum of its proper divisors (91872658476).

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

68904493836 is a wasteful number, since it uses less digits than its factorization.

68904493836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5742041160 (or 5742041158 counting only the distinct ones).

The product of its (nonzero) digits is 26873856, while the sum is 60.

The spelling of 68904493836 in words is "sixty-eight billion, nine hundred four million, four hundred ninety-three thousand, eight hundred thirty-six".