72757215 has 12 divisors (see below), whose sum is σ = 126112584. Its totient is φ = 38803824.

The previous prime is 72757171. The next prime is 72757249. The reversal of 72757215 is 51275727.

72757215 is a `hidden beast` number, since 72 + 7 + 572 + 15 = 666.

It is not a de Polignac number, because 72757215 - 2⁶ = 72757151 is a prime.

It is a super-2 number, since 2×72757215² = 10587224669112450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 72757215.

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 11 ways as a sum of consecutive naturals, for example, 808369 + ... + 808458.

It is an arithmetic number, because the mean of its divisors is an integer number (10509382).

Almost surely, 2^72757215 is an apocalyptic number.

72757215 is a deficient number, since it is larger than the sum of its proper divisors (53355369).

72757215 is a wasteful number, since it uses less digits than its factorization.

72757215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616838 (or 1616835 counting only the distinct ones).

The product of its digits is 34300, while the sum is 36.

The square root of 72757215 is about 8529.7839949204. The cubic root of 72757215 is about 417.4700804452.

The spelling of 72757215 in words is "seventy-two million, seven hundred fifty-seven thousand, two hundred fifteen".