72406317 has 4 divisors (see below), whose sum is σ = 96541760. Its totient is φ = 48270876.

The previous prime is 72406303. The next prime is 72406319. The reversal of 72406317 is 71360427.

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 not a de Polignac number, because 72406317 - 2¹⁶ = 72340781 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 (72406319) 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, 12067717 + ... + 12067722.

It is an arithmetic number, because the mean of its divisors is an integer number (24135440).

Almost surely, 2^72406317 is an apocalyptic number.

It is an amenable number.

72406317 is a deficient number, since it is larger than the sum of its proper divisors (24135443).

72406317 is a wasteful number, since it uses less digits than its factorization.

72406317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24135442.

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 72406317 is about 8509.1901494796. The cubic root of 72406317 is about 416.7978651022.

The spelling of 72406317 in words is "seventy-two million, four hundred six thousand, three hundred seventeen".