68656388 has 6 divisors (see below), whose sum is σ = 120148686. Its totient is φ = 34328192.

The previous prime is 68656363. The next prime is 68656391. The reversal of 68656388 is 88365686.

It can be written as a sum of positive squares in only one way, i.e., 60715264 + 7941124 = 7792^2 + 2818^2 .

It is a super-2 number, since 2×68656388² = 9427399226413088, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8582045 + ... + 8582052.

It is an arithmetic number, because the mean of its divisors is an integer number (20024781).

Almost surely, 2^68656388 is an apocalyptic number.

It is an amenable number.

68656388 is a deficient number, since it is larger than the sum of its proper divisors (51492298).

68656388 is a wasteful number, since it uses less digits than its factorization.

68656388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17164101 (or 17164099 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 50.

The square root of 68656388 is about 8285.9150369769. The cubic root of 68656388 is about 409.4746155653.

The spelling of 68656388 in words is "sixty-eight million, six hundred fifty-six thousand, three hundred eighty-eight".