72115615 has 48 divisors (see below), whose sum is σ = 108309600. Its totient is φ = 45434880.

The previous prime is 72115609. The next prime is 72115619. The reversal of 72115615 is 51651127.

It is not a de Polignac number, because 72115615 - 2³ = 72115607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72115619) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 206461 + ... + 206809.

It is an arithmetic number, because the mean of its divisors is an integer number (2256450).

Almost surely, 2^72115615 is an apocalyptic number.

72115615 is a deficient number, since it is larger than the sum of its proper divisors (36193985).

72115615 is a wasteful number, since it uses less digits than its factorization.

72115615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412 (or 395 counting only the distinct ones).

The product of its digits is 2100, while the sum is 28.

The square root of 72115615 is about 8492.0913207525. The cubic root of 72115615 is about 416.2393204281.

The spelling of 72115615 in words is "seventy-two million, one hundred fifteen thousand, six hundred fifteen".