68891564 has 24 divisors (see below), whose sum is σ = 137991168. Its totient is φ = 29480400.

The previous prime is 68891503. The next prime is 68891567. The reversal of 68891564 is 46519886.

It is not an unprimeable number, because it can be changed into a prime (68891567) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 22739 + ... + 25589.

It is an arithmetic number, because the mean of its divisors is an integer number (5749632).

Almost surely, 2^68891564 is an apocalyptic number.

It is an amenable number.

68891564 is an abundant number, since it is smaller than the sum of its proper divisors (69099604).

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

68891564 is a wasteful number, since it uses less digits than its factorization.

68891564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3725 (or 3723 counting only the distinct ones).

The product of its digits is 414720, while the sum is 47.

The square root of 68891564 is about 8300.0942163327. The cubic root of 68891564 is about 409.9416216703.

The spelling of 68891564 in words is "sixty-eight million, eight hundred ninety-one thousand, five hundred sixty-four".