72511745 has 16 divisors (see below), whose sum is σ = 90452160. Its totient is φ = 55737024.

The previous prime is 72511729. The next prime is 72511763. The reversal of 72511745 is 54711527.

It is a cyclic number.

It is not a de Polignac number, because 72511745 - 2⁴ = 72511729 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31814 + ... + 34016.

It is an arithmetic number, because the mean of its divisors is an integer number (5653260).

Almost surely, 2^72511745 is an apocalyptic number.

It is an amenable number.

72511745 is a deficient number, since it is larger than the sum of its proper divisors (17940415).

72511745 is a wasteful number, since it uses less digits than its factorization.

72511745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2464.

The product of its digits is 9800, while the sum is 32.

The square root of 72511745 is about 8515.3828451808. The cubic root of 72511745 is about 417.0000613418. Note that the first 4 decimals are identical.

Subtracting from 72511745 its sum of digits (32), we obtain a cube (72511713 = 417³).

The spelling of 72511745 in words is "seventy-two million, five hundred eleven thousand, seven hundred forty-five".