68308864 has 32 divisors (see below), whose sum is σ = 146555640. Its totient is φ = 31526400.

The previous prime is 68308861. The next prime is 68308913. The reversal of 68308864 is 46880386.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×68308864² = 9332201801940992, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 68308864.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68308861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18862 + ... + 22189.

Almost surely, 2^68308864 is an apocalyptic number.

68308864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

68308864 is an abundant number, since it is smaller than the sum of its proper divisors (78246776).

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

68308864 is a wasteful number, since it uses less digits than its factorization.

68308864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41078 (or 41066 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 43.

The square root of 68308864 is about 8264.9176644417. The cubic root of 68308864 is about 408.7825554907.

The spelling of 68308864 in words is "sixty-eight million, three hundred eight thousand, eight hundred sixty-four".