72312505806 has 16 divisors (see below), whose sum is σ = 147353786064. Its totient is φ = 23649372864.

The previous prime is 72312505763. The next prime is 72312505823. The reversal of 72312505806 is 60850521327.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113698591 + ... + 113699226.

It is an arithmetic number, because the mean of its divisors is an integer number (9209611629).

Almost surely, 2^72312505806 is an apocalyptic number.

72312505806 is an abundant number, since it is smaller than the sum of its proper divisors (75041280258).

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

72312505806 is a wasteful number, since it uses less digits than its factorization.

72312505806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227397875.

The product of its (nonzero) digits is 100800, while the sum is 39.

The spelling of 72312505806 in words is "seventy-two billion, three hundred twelve million, five hundred five thousand, eight hundred six".