72168215 has 16 divisors (see below), whose sum is σ = 99574272. Its totient is φ = 49186464.

The previous prime is 72168209. The next prime is 72168221. The reversal of 72168215 is 51286127.

It is an interprime number because it is at equal distance from previous prime (72168209) and next prime (72168221).

It is a cyclic number.

It is not a de Polignac number, because 72168215 - 2⁴ = 72168199 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 329 + ... + 12018.

It is an arithmetic number, because the mean of its divisors is an integer number (6223392).

Almost surely, 2^72168215 is an apocalyptic number.

72168215 is a deficient number, since it is larger than the sum of its proper divisors (27406057).

72168215 is a wasteful number, since it uses less digits than its factorization.

72168215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12526.

The product of its digits is 6720, while the sum is 32.

The square root of 72168215 is about 8495.1877554295. The cubic root of 72168215 is about 416.3404953138.

The spelling of 72168215 in words is "seventy-two million, one hundred sixty-eight thousand, two hundred fifteen".