31440443232 has 48 divisors (see below), whose sum is σ = 90033999552. Its totient is φ = 9527406720.

The previous prime is 31440443201. The next prime is 31440443261. The reversal of 31440443232 is 23234404413.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×31440443232² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31440443232.

It is a congruent number.

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, 14885518 + ... + 14887629.

It is an arithmetic number, because the mean of its divisors is an integer number (1875708324).

Almost surely, 2^31440443232 is an apocalyptic number.

31440443232 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31440443232 is an abundant number, since it is smaller than the sum of its proper divisors (58593556320).

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

31440443232 is a wasteful number, since it uses less digits than its factorization.

31440443232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29773171 (or 29773163 counting only the distinct ones).

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

Adding to 31440443232 its reverse (23234404413), we get a palindrome (54674847645).

The spelling of 31440443232 in words is "thirty-one billion, four hundred forty million, four hundred forty-three thousand, two hundred thirty-two".