31443479712 has 144 divisors (see below), whose sum is σ = 92315943720. Its totient is φ = 10144382976.

The previous prime is 31443479687. The next prime is 31443479723. The reversal of 31443479712 is 21797434413.

It can be written as a sum of positive squares in 4 ways, for example, as 29706590736 + 1736888976 = 172356^2 + 41676^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2048964 + ... + 2064252.

Almost surely, 2^31443479712 is an apocalyptic number.

31443479712 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31443479712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46157971860).

31443479712 is an abundant number, since it is smaller than the sum of its proper divisors (60872464008).

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

31443479712 is a wasteful number, since it uses less digits than its factorization.

31443479712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15535 (or 15524 counting only the distinct ones).

The product of its digits is 508032, while the sum is 45.

The spelling of 31443479712 in words is "thirty-one billion, four hundred forty-three million, four hundred seventy-nine thousand, seven hundred twelve".