72215715 has 64 divisors (see below), whose sum is σ = 137313792. Its totient is φ = 31948800.

The previous prime is 72215687. The next prime is 72215723. The reversal of 72215715 is 51751227.

It is not a de Polignac number, because 72215715 - 2⁸ = 72215459 is a prime.

It is a super-2 number, since 2×72215715² = 10430218985922450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 280867 + ... + 281123.

It is an arithmetic number, because the mean of its divisors is an integer number (2145528).

Almost surely, 2^72215715 is an apocalyptic number.

72215715 is a deficient number, since it is larger than the sum of its proper divisors (65098077).

72215715 is a wasteful number, since it uses less digits than its factorization.

72215715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420.

The product of its digits is 4900, while the sum is 30.

The square root of 72215715 is about 8497.9829959820. The cubic root of 72215715 is about 416.4318182336.

The spelling of 72215715 in words is "seventy-two million, two hundred fifteen thousand, seven hundred fifteen".