72312534 has 48 divisors (see below), whose sum is σ = 186937200. Its totient is φ = 20659968.

The previous prime is 72312523. The next prime is 72312547. The reversal of 72312534 is 43521327.

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 = 72312498 and 72312507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11019 + ... + 16310.

It is an arithmetic number, because the mean of its divisors is an integer number (3894525).

Almost surely, 2^72312534 is an apocalyptic number.

72312534 is an abundant number, since it is smaller than the sum of its proper divisors (114624666).

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

72312534 is a wasteful number, since it uses less digits than its factorization.

72312534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27354 (or 27341 counting only the distinct ones).

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

The square root of 72312534 is about 8503.6776749827. The cubic root of 72312534 is about 416.6178373357.

The spelling of 72312534 in words is "seventy-two million, three hundred twelve thousand, five hundred thirty-four".