72231534 has 16 divisors (see below), whose sum is σ = 160514640. Its totient is φ = 24077160.

The previous prime is 72231499. The next prime is 72231539. The reversal of 72231534 is 43513227.

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 = 72231498 and 72231507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72231539) 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 7 ways as a sum of consecutive naturals, for example, 668757 + ... + 668864.

It is an arithmetic number, because the mean of its divisors is an integer number (10032165).

Almost surely, 2^72231534 is an apocalyptic number.

72231534 is an abundant number, since it is smaller than the sum of its proper divisors (88283106).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72231534 is a wasteful number, since it uses less digits than its factorization.

72231534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337632 (or 1337626 counting only the distinct ones).

The product of its digits is 5040, while the sum is 27.

The square root of 72231534 is about 8498.9136952907. The cubic root of 72231534 is about 416.4622227606.

The spelling of 72231534 in words is "seventy-two million, two hundred thirty-one thousand, five hundred thirty-four".