72232157 has 4 divisors (see below), whose sum is σ = 72286140. Its totient is φ = 72178176.

The previous prime is 72232151. The next prime is 72232159. The reversal of 72232157 is 75123227.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70324996 + 1907161 = 8386^2 + 1381^2 .

It is a cyclic number.

It is not a de Polignac number, because 72232157 - 2⁶ = 72232093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72232151) 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, 24932 + ... + 27677.

It is an arithmetic number, because the mean of its divisors is an integer number (18071535).

Almost surely, 2^72232157 is an apocalyptic number.

It is an amenable number.

72232157 is a deficient number, since it is larger than the sum of its proper divisors (53983).

72232157 is a wasteful number, since it uses less digits than its factorization.

72232157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53982.

The product of its digits is 5880, while the sum is 29.

The square root of 72232157 is about 8498.9503469546. The cubic root of 72232157 is about 416.4634200919.

The spelling of 72232157 in words is "seventy-two million, two hundred thirty-two thousand, one hundred fifty-seven".