72388717 has 4 divisors (see below), whose sum is σ = 72406656. Its totient is φ = 72370780.

The previous prime is 72388697. The next prime is 72388733. The reversal of 72388717 is 71788327.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72388717 - 2²³ = 64000109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72388747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228 + ... + 12034.

It is an arithmetic number, because the mean of its divisors is an integer number (18101664).

Almost surely, 2^72388717 is an apocalyptic number.

It is an amenable number.

72388717 is a deficient number, since it is larger than the sum of its proper divisors (17939).

72388717 is a wasteful number, since it uses less digits than its factorization.

72388717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17938.

The product of its digits is 131712, while the sum is 43.

The square root of 72388717 is about 8508.1559106542. The cubic root of 72388717 is about 416.7640916361.

The spelling of 72388717 in words is "seventy-two million, three hundred eighty-eight thousand, seven hundred seventeen".