72407665 has 16 divisors (see below), whose sum is σ = 94968576. Its totient is φ = 52560000.

The previous prime is 72407663. The next prime is 72407669. The reversal of 72407665 is 56670427.

It is not a de Polignac number, because 72407665 - 2¹ = 72407663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72407663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40429 + ... + 42181.

It is an arithmetic number, because the mean of its divisors is an integer number (5935536).

Almost surely, 2^72407665 is an apocalyptic number.

It is an amenable number.

72407665 is a deficient number, since it is larger than the sum of its proper divisors (22560911).

72407665 is a wasteful number, since it uses less digits than its factorization.

72407665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2520.

The product of its (nonzero) digits is 70560, while the sum is 37.

The square root of 72407665 is about 8509.2693575888. The cubic root of 72407665 is about 416.8004516170.

The spelling of 72407665 in words is "seventy-two million, four hundred seven thousand, six hundred sixty-five".