72665293 has 6 divisors (see below), whose sum is σ = 77191466. Its totient is φ = 68390592.

The previous prime is 72665273. The next prime is 72665309. The reversal of 72665293 is 39256627.

It can be written as a sum of positive squares in 3 ways, for example, as 9653449 + 63011844 = 3107^2 + 7938^2 .

It is not a de Polignac number, because 72665293 - 2⁵ = 72665261 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 (72665273) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 125430 + ... + 126007.

Almost surely, 2^72665293 is an apocalyptic number.

It is an amenable number.

72665293 is a deficient number, since it is larger than the sum of its proper divisors (4526173).

72665293 is a wasteful number, since it uses less digits than its factorization.

72665293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251471 (or 251454 counting only the distinct ones).

The product of its digits is 136080, while the sum is 40.

The square root of 72665293 is about 8524.3939960563. The cubic root of 72665293 is about 417.2941947637.

The spelling of 72665293 in words is "seventy-two million, six hundred sixty-five thousand, two hundred ninety-three".