72115578 has 24 divisors (see below), whose sum is σ = 159576768. Its totient is φ = 23526792.

The previous prime is 72115529. The next prime is 72115591. The reversal of 72115578 is 87551127.

72115578 is a `hidden beast` number, since 72 + 1 + 15 + 578 = 666.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 41776 + ... + 43467.

It is an arithmetic number, because the mean of its divisors is an integer number (6649032).

Almost surely, 2^72115578 is an apocalyptic number.

72115578 is an abundant number, since it is smaller than the sum of its proper divisors (87461190).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72115578 is a wasteful number, since it uses less digits than its factorization.

72115578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85298 (or 85295 counting only the distinct ones).

The product of its digits is 19600, while the sum is 36.

The square root of 72115578 is about 8492.0891422547. The cubic root of 72115578 is about 416.2392492421.

The spelling of 72115578 in words is "seventy-two million, one hundred fifteen thousand, five hundred seventy-eight".