72146656 has 24 divisors (see below), whose sum is σ = 142289784. Its totient is φ = 36009600.

The previous prime is 72146639. The next prime is 72146689. The reversal of 72146656 is 65664127.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20206 + ... + 23506.

It is an arithmetic number, because the mean of its divisors is an integer number (5928741).

Almost surely, 2^72146656 is an apocalyptic number.

It is an amenable number.

72146656 is a deficient number, since it is larger than the sum of its proper divisors (70143128).

72146656 is a wasteful number, since it uses less digits than its factorization.

72146656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3994 (or 3986 counting only the distinct ones).

The product of its digits is 60480, while the sum is 37.

The square root of 72146656 is about 8493.9187657994. The cubic root of 72146656 is about 416.2990330224.

The spelling of 72146656 in words is "seventy-two million, one hundred forty-six thousand, six hundred fifty-six".