72238891 has 4 divisors (see below), whose sum is σ = 72557352. Its totient is φ = 71920432.

The previous prime is 72238889. The next prime is 72238919. The reversal of 72238891 is 19883227.

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 72238891 - 2¹ = 72238889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72238811) 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, 158890 + ... + 159343.

It is an arithmetic number, because the mean of its divisors is an integer number (18139338).

Almost surely, 2^72238891 is an apocalyptic number.

72238891 is a deficient number, since it is larger than the sum of its proper divisors (318461).

72238891 is a wasteful number, since it uses less digits than its factorization.

72238891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318460.

The product of its digits is 48384, while the sum is 40.

The square root of 72238891 is about 8499.3465042908. The cubic root of 72238891 is about 416.4763615926.

The spelling of 72238891 in words is "seventy-two million, two hundred thirty-eight thousand, eight hundred ninety-one".