72724745 has 16 divisors (see below), whose sum is σ = 90823680. Its totient is φ = 55857984.

The previous prime is 72724733. The next prime is 72724753. The reversal of 72724745 is 54742727.

It is a cyclic number.

It is not a de Polignac number, because 72724745 - 2²⁶ = 5615881 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72724699 and 72724708.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 9536 + ... + 15374.

It is an arithmetic number, because the mean of its divisors is an integer number (5676480).

Almost surely, 2^72724745 is an apocalyptic number.

It is an amenable number.

72724745 is a deficient number, since it is larger than the sum of its proper divisors (18098935).

72724745 is a wasteful number, since it uses less digits than its factorization.

72724745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5944.

The product of its digits is 109760, while the sum is 38.

The square root of 72724745 is about 8527.8804517887. The cubic root of 72724745 is about 417.4079685274.

The spelling of 72724745 in words is "seventy-two million, seven hundred twenty-four thousand, seven hundred forty-five".