31475270840 has 128 divisors (see below), whose sum is σ = 81047070720. Its totient is φ = 10898227200.

The previous prime is 31475270839. The next prime is 31475270909. The reversal of 31475270840 is 4807257413.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2477705 + ... + 2490375.

It is an arithmetic number, because the mean of its divisors is an integer number (633180240).

Almost surely, 2^31475270840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31475270840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40523535360).

31475270840 is an abundant number, since it is smaller than the sum of its proper divisors (49571799880).

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

31475270840 is a wasteful number, since it uses less digits than its factorization.

31475270840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12993 (or 12989 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 41.

The spelling of 31475270840 in words is "thirty-one billion, four hundred seventy-five million, two hundred seventy thousand, eight hundred forty".