72215165 has 16 divisors (see below), whose sum is σ = 95872896. Its totient is φ = 51777600.

The previous prime is 72215159. The next prime is 72215173. The reversal of 72215165 is 56151227.

It is not a de Polignac number, because 72215165 - 2⁴ = 72215149 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 15 ways as a sum of consecutive naturals, for example, 5342 + ... + 13151.

It is an arithmetic number, because the mean of its divisors is an integer number (5992056).

Almost surely, 2^72215165 is an apocalyptic number.

It is an amenable number.

72215165 is a deficient number, since it is larger than the sum of its proper divisors (23657731).

72215165 is a wasteful number, since it uses less digits than its factorization.

72215165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18580.

The product of its digits is 4200, while the sum is 29.

The square root of 72215165 is about 8497.9506353003. The cubic root of 72215165 is about 416.4307610395.

The spelling of 72215165 in words is "seventy-two million, two hundred fifteen thousand, one hundred sixty-five".