68720056 has 16 divisors (see below), whose sum is σ = 133007040. Its totient is φ = 33251520.

The previous prime is 68720051. The next prime is 68720077. The reversal of 68720056 is 65002786.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68720051) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 138301 + ... + 138796.

It is an arithmetic number, because the mean of its divisors is an integer number (8312940).

Almost surely, 2^68720056 is an apocalyptic number.

It is an amenable number.

68720056 is a deficient number, since it is larger than the sum of its proper divisors (64286984).

68720056 is a wasteful number, since it uses less digits than its factorization.

68720056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277134 (or 277130 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 68720056 is about 8289.7560880885. The cubic root of 68720056 is about 409.6011508909.

The spelling of 68720056 in words is "sixty-eight million, seven hundred twenty thousand, fifty-six".