72644515 has 4 divisors (see below), whose sum is σ = 87173424. Its totient is φ = 58115608.

The previous prime is 72644479. The next prime is 72644521. The reversal of 72644515 is 51544627.

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 72644515 - 2⁹ = 72644003 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7264447 + ... + 7264456.

It is an arithmetic number, because the mean of its divisors is an integer number (21793356).

Almost surely, 2^72644515 is an apocalyptic number.

72644515 is a deficient number, since it is larger than the sum of its proper divisors (14528909).

72644515 is a wasteful number, since it uses less digits than its factorization.

72644515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14528908.

The product of its digits is 33600, while the sum is 34.

The square root of 72644515 is about 8523.1751712610. The cubic root of 72644515 is about 417.2544171066.

The spelling of 72644515 in words is "seventy-two million, six hundred forty-four thousand, five hundred fifteen".