72493531 has 32 divisors (see below), whose sum is σ = 87736320. Its totient is φ = 59162400.

The previous prime is 72493513. The next prime is 72493537. The reversal of 72493531 is 13539427.

It is not a de Polignac number, because 72493531 - 2¹¹ = 72491483 is a prime.

It is a super-2 number, since 2×72493531² = 10510624073695922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72493537) 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 31 ways as a sum of consecutive naturals, for example, 434010 + ... + 434176.

It is an arithmetic number, because the mean of its divisors is an integer number (2741760).

Almost surely, 2^72493531 is an apocalyptic number.

72493531 is a deficient number, since it is larger than the sum of its proper divisors (15242789).

72493531 is a wasteful number, since it uses less digits than its factorization.

72493531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295.

The product of its digits is 22680, while the sum is 34.

The square root of 72493531 is about 8514.3133017290. The cubic root of 72493531 is about 416.9651434346.

The spelling of 72493531 in words is "seventy-two million, four hundred ninety-three thousand, five hundred thirty-one".