72637393 has 4 divisors (see below), whose sum is σ = 72703540. Its totient is φ = 72571248.

The previous prime is 72637387. The next prime is 72637403. The reversal of 72637393 is 39373627.

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 43401744 + 29235649 = 6588^2 + 5407^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72637393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72637333) 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, 31398 + ... + 33631.

It is an arithmetic number, because the mean of its divisors is an integer number (18175885).

Almost surely, 2^72637393 is an apocalyptic number.

It is an amenable number.

72637393 is a deficient number, since it is larger than the sum of its proper divisors (66147).

72637393 is a wasteful number, since it uses less digits than its factorization.

72637393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66146.

The product of its digits is 142884, while the sum is 40.

The square root of 72637393 is about 8522.7573589772. The cubic root of 72637393 is about 417.2407809172.

The spelling of 72637393 in words is "seventy-two million, six hundred thirty-seven thousand, three hundred ninety-three".