72957215 has 4 divisors (see below), whose sum is σ = 87548664. Its totient is φ = 58365768.

The previous prime is 72957191. The next prime is 72957221. The reversal of 72957215 is 51275927.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72957215 is a prime.

It is a Duffinian number.

It is a congruent 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, 7295717 + ... + 7295726.

It is an arithmetic number, because the mean of its divisors is an integer number (21887166).

Almost surely, 2^72957215 is an apocalyptic number.

72957215 is a deficient number, since it is larger than the sum of its proper divisors (14591449).

72957215 is a wasteful number, since it uses less digits than its factorization.

72957215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14591448.

The product of its digits is 44100, while the sum is 38.

The square root of 72957215 is about 8541.4995756015. The cubic root of 72957215 is about 417.8522538971.

The spelling of 72957215 in words is "seventy-two million, nine hundred fifty-seven thousand, two hundred fifteen".