31440243432 has 32 divisors (see below), whose sum is σ = 84646810080. Its totient is φ = 9673920960.

The previous prime is 31440243413. The next prime is 31440243463. The reversal of 31440243432 is 23434204413.

It is a happy number.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 31440243432.

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, 50384694 + ... + 50385317.

It is an arithmetic number, because the mean of its divisors is an integer number (2645212815).

Almost surely, 2^31440243432 is an apocalyptic number.

It is an amenable number.

31440243432 is an abundant number, since it is smaller than the sum of its proper divisors (53206566648).

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

31440243432 is a wasteful number, since it uses less digits than its factorization.

31440243432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100770033 (or 100770029 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 30.

Adding to 31440243432 its reverse (23434204413), we get a palindrome (54874447845).

The spelling of 31440243432 in words is "thirty-one billion, four hundred forty million, two hundred forty-three thousand, four hundred thirty-two".