72205015 has 4 divisors (see below), whose sum is σ = 86646024. Its totient is φ = 57764008.

The previous prime is 72204989. The next prime is 72205033. The reversal of 72205015 is 51050227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51050227 = 97 ⋅526291.

It is a cyclic number.

It is not a de Polignac number, because 72205015 - 2⁷ = 72204887 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 3 ways as a sum of consecutive naturals, for example, 7220497 + ... + 7220506.

It is an arithmetic number, because the mean of its divisors is an integer number (21661506).

Almost surely, 2^72205015 is an apocalyptic number.

72205015 is a deficient number, since it is larger than the sum of its proper divisors (14441009).

72205015 is a wasteful number, since it uses less digits than its factorization.

72205015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14441008.

The product of its (nonzero) digits is 700, while the sum is 22.

The square root of 72205015 is about 8497.3534115041. The cubic root of 72205015 is about 416.4112500394.

It can be divided in two parts, 7 and 2205015, that added together give a palindrome (2205022).

The spelling of 72205015 in words is "seventy-two million, two hundred five thousand, fifteen".