72144536 has 32 divisors (see below), whose sum is σ = 137479680. Its totient is φ = 35488800.

The previous prime is 72144529. The next prime is 72144563. The reversal of 72144536 is 63544127.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231821 + ... + 232131.

It is an arithmetic number, because the mean of its divisors is an integer number (4296240).

Almost surely, 2^72144536 is an apocalyptic number.

It is an amenable number.

72144536 is a deficient number, since it is larger than the sum of its proper divisors (65335144).

72144536 is a wasteful number, since it uses less digits than its factorization.

72144536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695 (or 691 counting only the distinct ones).

The product of its digits is 20160, while the sum is 32.

The square root of 72144536 is about 8493.7939697169. The cubic root of 72144536 is about 416.2949553901.

The spelling of 72144536 in words is "seventy-two million, one hundred forty-four thousand, five hundred thirty-six".