72205115 has 4 divisors (see below), whose sum is σ = 86646144. Its totient is φ = 57764088.

The previous prime is 72205087. The next prime is 72205117. The reversal of 72205115 is 51150227.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51150227 = 59 ⋅866953.

It is a cyclic number.

It is not a de Polignac number, because 72205115 - 2⁶ = 72205051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72205117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7220507 + ... + 7220516.

It is an arithmetic number, because the mean of its divisors is an integer number (21661536).

Almost surely, 2^72205115 is an apocalyptic number.

72205115 is a deficient number, since it is larger than the sum of its proper divisors (14441029).

72205115 is a wasteful number, since it uses less digits than its factorization.

72205115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14441028.

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 72205115 is about 8497.3592956871. The cubic root of 72205115 is about 416.4114422749.

The spelling of 72205115 in words is "seventy-two million, two hundred five thousand, one hundred fifteen".