72158715 has 32 divisors (see below), whose sum is σ = 128715840. Its totient is φ = 38354688.

The previous prime is 72158701. The next prime is 72158717. The reversal of 72158715 is 51785127.

72158715 is a `hidden beast` number, since 72 + 1 + 587 + 1 + 5 = 666.

It is not a de Polignac number, because 72158715 - 2¹⁰ = 72157691 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72158715.

It is not an unprimeable number, because it can be changed into a prime (72158717) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49639 + ... + 51071.

It is an arithmetic number, because the mean of its divisors is an integer number (4022370).

Almost surely, 2^72158715 is an apocalyptic number.

72158715 is a deficient number, since it is larger than the sum of its proper divisors (56557125).

72158715 is a wasteful number, since it uses less digits than its factorization.

72158715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820 (or 1814 counting only the distinct ones).

The product of its digits is 19600, while the sum is 36.

The square root of 72158715 is about 8494.6285969429. The cubic root of 72158715 is about 416.3222259216.

The spelling of 72158715 in words is "seventy-two million, one hundred fifty-eight thousand, seven hundred fifteen".