72308665 has 32 divisors (see below), whose sum is σ = 106396416. Its totient is φ = 46421760.

The previous prime is 72308659. The next prime is 72308669. The reversal of 72308665 is 56680327.

It is not a de Polignac number, because 72308665 - 2⁹ = 72308153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72308669) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14247 + ... + 18643.

It is an arithmetic number, because the mean of its divisors is an integer number (3324888).

Almost surely, 2^72308665 is an apocalyptic number.

It is an amenable number.

72308665 is a deficient number, since it is larger than the sum of its proper divisors (34087751).

72308665 is a wasteful number, since it uses less digits than its factorization.

72308665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4449.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 72308665 is about 8503.4501821320. The cubic root of 72308665 is about 416.6104069818.

The spelling of 72308665 in words is "seventy-two million, three hundred eight thousand, six hundred sixty-five".