72865015 has 4 divisors (see below), whose sum is σ = 87438024. Its totient is φ = 58292008.

The previous prime is 72865003. The next prime is 72865031. The reversal of 72865015 is 51056827.

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

It is a cyclic number.

It is not a de Polignac number, because 72865015 - 2²¹ = 70767863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7286497 + ... + 7286506.

It is an arithmetic number, because the mean of its divisors is an integer number (21859506).

Almost surely, 2^72865015 is an apocalyptic number.

72865015 is a deficient number, since it is larger than the sum of its proper divisors (14573009).

72865015 is a wasteful number, since it uses less digits than its factorization.

72865015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14573008.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 72865015 is about 8536.1006905964. The cubic root of 72865015 is about 417.6761588240.

The spelling of 72865015 in words is "seventy-two million, eight hundred sixty-five thousand, fifteen".