72881624 has 8 divisors (see below), whose sum is σ = 136653060. Its totient is φ = 36440808.

The previous prime is 72881623. The next prime is 72881647. The reversal of 72881624 is 42618827.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×72881624² = 10623462233754752, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72881621) 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 as a sum of consecutive naturals, namely, 4555094 + ... + 4555109.

Almost surely, 2^72881624 is an apocalyptic number.

It is an amenable number.

72881624 is a deficient number, since it is larger than the sum of its proper divisors (63771436).

72881624 is a wasteful number, since it uses less digits than its factorization.

72881624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9110209 (or 9110205 counting only the distinct ones).

The product of its digits is 43008, while the sum is 38.

The square root of 72881624 is about 8537.0735032563. The cubic root of 72881624 is about 417.7078917313.

The spelling of 72881624 in words is "seventy-two million, eight hundred eighty-one thousand, six hundred twenty-four".