72748913 has 4 divisors (see below), whose sum is σ = 74121588. Its totient is φ = 71376240.

The previous prime is 72748901. The next prime is 72748937. The reversal of 72748913 is 31984727.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 65092624 + 7656289 = 8068^2 + 2767^2 .

It is a cyclic number.

It is not a de Polignac number, because 72748913 - 2¹⁸ = 72486769 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72748213) 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 3 ways as a sum of consecutive naturals, for example, 686258 + ... + 686363.

It is an arithmetic number, because the mean of its divisors is an integer number (18530397).

Almost surely, 2^72748913 is an apocalyptic number.

It is an amenable number.

72748913 is a deficient number, since it is larger than the sum of its proper divisors (1372675).

72748913 is a wasteful number, since it uses less digits than its factorization.

72748913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1372674.

The product of its digits is 84672, while the sum is 41.

The square root of 72748913 is about 8529.2973333095. The cubic root of 72748913 is about 417.4542012941.

The spelling of 72748913 in words is "seventy-two million, seven hundred forty-eight thousand, nine hundred thirteen".