72578387 has 16 divisors (see below), whose sum is σ = 87644160. Its totient is φ = 58779168.

The previous prime is 72578377. The next prime is 72578417. The reversal of 72578387 is 78387527.

It is a happy number.

It is not a de Polignac number, because 72578387 - 2⁴ = 72578371 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72578357) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5738 + ... + 13344.

It is an arithmetic number, because the mean of its divisors is an integer number (5477760).

Almost surely, 2^72578387 is an apocalyptic number.

72578387 is a deficient number, since it is larger than the sum of its proper divisors (15065773).

72578387 is a wasteful number, since it uses less digits than its factorization.

72578387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7690.

The product of its digits is 658560, while the sum is 47.

The square root of 72578387 is about 8519.2949825675. The cubic root of 72578387 is about 417.1277703497.

The spelling of 72578387 in words is "seventy-two million, five hundred seventy-eight thousand, three hundred eighty-seven".