72115385 has 4 divisors (see below), whose sum is σ = 86538468. Its totient is φ = 57692304.

The previous prime is 72115333. The next prime is 72115397. The reversal of 72115385 is 58351127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58351127 = 1373 ⋅42499.

It can be written as a sum of positive squares in 2 ways, for example, as 13623481 + 58491904 = 3691^2 + 7648^2 .

It is a cyclic number.

It is not a de Polignac number, because 72115385 - 2²² = 67921081 is a prime.

It is a Duffinian 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, 7211534 + ... + 7211543.

It is an arithmetic number, because the mean of its divisors is an integer number (21634617).

Almost surely, 2^72115385 is an apocalyptic number.

It is an amenable number.

72115385 is a deficient number, since it is larger than the sum of its proper divisors (14423083).

72115385 is a wasteful number, since it uses less digits than its factorization.

72115385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14423082.

The product of its digits is 8400, while the sum is 32.

The square root of 72115385 is about 8492.0777787300. The cubic root of 72115385 is about 416.2388779204.

The spelling of 72115385 in words is "seventy-two million, one hundred fifteen thousand, three hundred eighty-five".