72438571 has 4 divisors (see below), whose sum is σ = 72706144. Its totient is φ = 72171000.

The previous prime is 72438551. The next prime is 72438577. The reversal of 72438571 is 17583427.

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 72438571 - 2⁹ = 72438059 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72438571.

It is not an unprimeable number, because it can be changed into a prime (72438577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133380 + ... + 133921.

It is an arithmetic number, because the mean of its divisors is an integer number (18176536).

Almost surely, 2^72438571 is an apocalyptic number.

72438571 is a deficient number, since it is larger than the sum of its proper divisors (267573).

72438571 is a wasteful number, since it uses less digits than its factorization.

72438571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267572.

The product of its digits is 47040, while the sum is 37.

The square root of 72438571 is about 8511.0851834534. The cubic root of 72438571 is about 416.8597446141.

The spelling of 72438571 in words is "seventy-two million, four hundred thirty-eight thousand, five hundred seventy-one".