68540656 has 20 divisors (see below), whose sum is σ = 133096392. Its totient is φ = 34193216.

The previous prime is 68540627. The next prime is 68540663. The reversal of 68540656 is 65604586.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2886 + ... + 12058.

Almost surely, 2^68540656 is an apocalyptic number.

It is an amenable number.

68540656 is a deficient number, since it is larger than the sum of its proper divisors (64555736).

68540656 is a wasteful number, since it uses less digits than its factorization.

68540656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9648 (or 9642 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 40.

The square root of 68540656 is about 8278.9284330763. The cubic root of 68540656 is about 409.2444064999.

It can be divided in two parts, 68540 and 656, that added together give a palindrome (69196).

The spelling of 68540656 in words is "sixty-eight million, five hundred forty thousand, six hundred fifty-six".