72117415 has 4 divisors (see below), whose sum is σ = 86540904. Its totient is φ = 57693928.

The previous prime is 72117413. The next prime is 72117421. The reversal of 72117415 is 51471127.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72117415 - 2¹ = 72117413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72117413) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7211737 + ... + 7211746.

It is an arithmetic number, because the mean of its divisors is an integer number (21635226).

Almost surely, 2^72117415 is an apocalyptic number.

72117415 is a deficient number, since it is larger than the sum of its proper divisors (14423489).

72117415 is a wasteful number, since it uses less digits than its factorization.

72117415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14423488.

The product of its digits is 1960, while the sum is 28.

The square root of 72117415 is about 8492.1973010523. The cubic root of 72117415 is about 416.2427834994.

The spelling of 72117415 in words is "seventy-two million, one hundred seventeen thousand, four hundred fifteen".