72156628 has 12 divisors (see below), whose sum is σ = 126333760. Its totient is φ = 36061272.

The previous prime is 72156613. The next prime is 72156629. The reversal of 72156628 is 82665127.

It is a happy number.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72156629) 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, 13375 + ... + 17977.

Almost surely, 2^72156628 is an apocalyptic number.

It is an amenable number.

72156628 is a deficient number, since it is larger than the sum of its proper divisors (54177132).

72156628 is a wasteful number, since it uses less digits than its factorization.

72156628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8526 (or 8524 counting only the distinct ones).

The product of its digits is 40320, while the sum is 37.

The square root of 72156628 is about 8494.5057537210. The cubic root of 72156628 is about 416.3182122098.

The spelling of 72156628 in words is "seventy-two million, one hundred fifty-six thousand, six hundred twenty-eight".