68681564 has 24 divisors (see below), whose sum is σ = 145444320. Its totient is φ = 27703296.

The previous prime is 68681563. The next prime is 68681603. The reversal of 68681564 is 46518686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68681563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71669 + ... + 72620.

It is an arithmetic number, because the mean of its divisors is an integer number (6060180).

Almost surely, 2^68681564 is an apocalyptic number.

It is an amenable number.

68681564 is an abundant number, since it is smaller than the sum of its proper divisors (76762756).

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

68681564 is a wasteful number, since it uses less digits than its factorization.

68681564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144317 (or 144315 counting only the distinct ones).

The product of its digits is 276480, while the sum is 44.

The square root of 68681564 is about 8287.4341023021. The cubic root of 68681564 is about 409.5246603045.

The spelling of 68681564 in words is "sixty-eight million, six hundred eighty-one thousand, five hundred sixty-four".