68643856 has 20 divisors (see below), whose sum is σ = 133672000. Its totient is φ = 34147872.

The previous prime is 68643833. The next prime is 68643857. The reversal of 68643856 is 65834686.

It is not an unprimeable number, because it can be changed into a prime (68643857) 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, 7596 + ... + 13963.

It is an arithmetic number, because the mean of its divisors is an integer number (6683600).

Almost surely, 2^68643856 is an apocalyptic number.

It is an amenable number.

68643856 is a deficient number, since it is larger than the sum of its proper divisors (65028144).

68643856 is a wasteful number, since it uses less digits than its factorization.

68643856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21766 (or 21760 counting only the distinct ones).

The product of its digits is 829440, while the sum is 46.

The square root of 68643856 is about 8285.1587794079. The cubic root of 68643856 is about 409.4496999516.

The spelling of 68643856 in words is "sixty-eight million, six hundred forty-three thousand, eight hundred fifty-six".