72284531 has 16 divisors (see below), whose sum is σ = 83328000. Its totient is φ = 62013600.

The previous prime is 72284521. The next prime is 72284539. The reversal of 72284531 is 13548227.

It is not a de Polignac number, because 72284531 - 2²² = 68090227 is a prime.

It is a super-2 number, since 2×72284531² = 10450106843779922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72284539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72446 + ... + 73436.

It is an arithmetic number, because the mean of its divisors is an integer number (5208000).

Almost surely, 2^72284531 is an apocalyptic number.

72284531 is a deficient number, since it is larger than the sum of its proper divisors (11043469).

72284531 is a wasteful number, since it uses less digits than its factorization.

72284531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1370.

The product of its digits is 13440, while the sum is 32.

The square root of 72284531 is about 8502.0309926511. The cubic root of 72284531 is about 416.5640520284.

The spelling of 72284531 in words is "seventy-two million, two hundred eighty-four thousand, five hundred thirty-one".