72215065 has 16 divisors (see below), whose sum is σ = 98815248. Its totient is φ = 50190336.

The previous prime is 72215057. The next prime is 72215071. The reversal of 72215065 is 56051227.

It can be written as a sum of positive squares in 8 ways, for example, as 795664 + 71419401 = 892^2 + 8451^2 .

It is a cyclic number.

It is not a de Polignac number, because 72215065 - 2³ = 72215057 is a prime.

It is a super-2 number, since 2×72215065² = 10430031225908450, which contains 22 as substring.

It is a Duffinian 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, 31572 + ... + 33781.

It is an arithmetic number, because the mean of its divisors is an integer number (6175953).

Almost surely, 2^72215065 is an apocalyptic number.

It is an amenable number.

72215065 is a deficient number, since it is larger than the sum of its proper divisors (26600183).

72215065 is a wasteful number, since it uses less digits than its factorization.

72215065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65388.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 72215065 is about 8497.9447515267. The cubic root of 72215065 is about 416.4305688218.

The spelling of 72215065 in words is "seventy-two million, two hundred fifteen thousand, sixty-five".