72544665 has 16 divisors (see below), whose sum is σ = 116683776. Its totient is φ = 38486400.

The previous prime is 72544663. The next prime is 72544687. The reversal of 72544665 is 56644527.

It is not a de Polignac number, because 72544665 - 2¹ = 72544663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72544663) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 9796 + ... + 15525.

It is an arithmetic number, because the mean of its divisors is an integer number (7292736).

Almost surely, 2^72544665 is an apocalyptic number.

It is an amenable number.

72544665 is a deficient number, since it is larger than the sum of its proper divisors (44139111).

72544665 is a wasteful number, since it uses less digits than its factorization.

72544665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25520.

The product of its digits is 201600, while the sum is 39.

The square root of 72544665 is about 8517.3155982387. The cubic root of 72544665 is about 417.0631571668.

The spelling of 72544665 in words is "seventy-two million, five hundred forty-four thousand, six hundred sixty-five".