68686864 has 20 divisors (see below), whose sum is σ = 134455804. Its totient is φ = 33988608.

The previous prime is 68686861. The next prime is 68686879. The reversal of 68686864 is 46868686.

It can be written as a sum of positive squares in 2 ways, for example, as 50979600 + 17707264 = 7140^2 + 4208^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68686861) 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, 20577 + ... + 23680.

Almost surely, 2^68686864 is an apocalyptic number.

It is an amenable number.

68686864 is a deficient number, since it is larger than the sum of its proper divisors (65768940).

68686864 is a wasteful number, since it uses less digits than its factorization.

68686864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44362 (or 44356 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 52.

The square root of 68686864 is about 8287.7538573488. The cubic root of 68686864 is about 409.5351940623.

The spelling of 68686864 in words is "sixty-eight million, six hundred eighty-six thousand, eight hundred sixty-four".