72531895605 has 32 divisors (see below), whose sum is σ = 125668583040. Its totient is φ = 35510711040.

The previous prime is 72531895589. The next prime is 72531895613. The reversal of 72531895605 is 50659813527.

It is a happy number.

It is not a de Polignac number, because 72531895605 - 2⁴ = 72531895589 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 992215 + ... + 1062804.

It is an arithmetic number, because the mean of its divisors is an integer number (3927143220).

Almost surely, 2^72531895605 is an apocalyptic number.

It is an amenable number.

72531895605 is a deficient number, since it is larger than the sum of its proper divisors (53136687435).

72531895605 is a wasteful number, since it uses less digits than its factorization.

72531895605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2055221.

The product of its (nonzero) digits is 2268000, while the sum is 51.

It can be divided in two parts, 72531 and 895605, that added together give a triangular number (968136 = T₁₃₉₁).

The spelling of 72531895605 in words is "seventy-two billion, five hundred thirty-one million, eight hundred ninety-five thousand, six hundred five".