72008165 has 4 divisors (see below), whose sum is σ = 86409804. Its totient is φ = 57606528.

The previous prime is 72008161. The next prime is 72008171. The reversal of 72008165 is 56180027.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40119556 + 31888609 = 6334^2 + 5647^2 .

It is a cyclic number.

It is not a de Polignac number, because 72008165 - 2² = 72008161 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 (72008161) 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, 7200812 + ... + 7200821.

It is an arithmetic number, because the mean of its divisors is an integer number (21602451).

Almost surely, 2^72008165 is an apocalyptic number.

It is an amenable number.

72008165 is a deficient number, since it is larger than the sum of its proper divisors (14401639).

72008165 is a wasteful number, since it uses less digits than its factorization.

72008165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14401638.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 72008165 is about 8485.7624878381. The cubic root of 72008165 is about 416.0324898349.

The spelling of 72008165 in words is "seventy-two million, eight thousand, one hundred sixty-five".