72531606 has 16 divisors (see below), whose sum is σ = 165786624. Its totient is φ = 20723304.

The previous prime is 72531593. The next prime is 72531611. The reversal of 72531606 is 60613527.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 863430 + ... + 863513.

It is an arithmetic number, because the mean of its divisors is an integer number (10361664).

Almost surely, 2^72531606 is an apocalyptic number.

72531606 is an abundant number, since it is smaller than the sum of its proper divisors (93255018).

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

72531606 is a wasteful number, since it uses less digits than its factorization.

72531606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1726955.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 72531606 is about 8516.5489489581. The cubic root of 72531606 is about 417.0381300353.

It can be divided in two parts, 72531 and 606, that added together give a palindrome (73137).

The spelling of 72531606 in words is "seventy-two million, five hundred thirty-one thousand, six hundred six".