72238251 has 4 divisors (see below), whose sum is σ = 96317672. Its totient is φ = 48158832.

The previous prime is 72238241. The next prime is 72238259. The reversal of 72238251 is 15283227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15283227 = 3 ⋅5094409.

It is not a de Polignac number, because 72238251 - 2¹⁷ = 72107179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72238259) 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, 12039706 + ... + 12039711.

It is an arithmetic number, because the mean of its divisors is an integer number (24079418).

Almost surely, 2^72238251 is an apocalyptic number.

72238251 is a deficient number, since it is larger than the sum of its proper divisors (24079421).

72238251 is a wasteful number, since it uses less digits than its factorization.

72238251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24079420.

The product of its digits is 6720, while the sum is 30.

The square root of 72238251 is about 8499.3088542540. The cubic root of 72238251 is about 416.4751316657.

The spelling of 72238251 in words is "seventy-two million, two hundred thirty-eight thousand, two hundred fifty-one".