72237231 has 32 divisors (see below), whose sum is σ = 120787200. Its totient is φ = 42265440.

The previous prime is 72237229. The next prime is 72237239. The reversal of 72237231 is 13273227.

It is a happy number.

It is not a de Polignac number, because 72237231 - 2¹ = 72237229 is a prime.

It is a super-2 number, since 2×72237231² = 10436435085094722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 72237195 and 72237204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72237239) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4420 + ... + 12806.

It is an arithmetic number, because the mean of its divisors is an integer number (3774600).

Almost surely, 2^72237231 is an apocalyptic number.

72237231 is a deficient number, since it is larger than the sum of its proper divisors (48549969).

72237231 is a wasteful number, since it uses less digits than its factorization.

72237231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8436 (or 8430 counting only the distinct ones).

The product of its digits is 3528, while the sum is 27.

The square root of 72237231 is about 8499.2488491631. The cubic root of 72237231 is about 416.4731714547.

The spelling of 72237231 in words is "seventy-two million, two hundred thirty-seven thousand, two hundred thirty-one".