31230133440 has 112 divisors (see below), whose sum is σ = 108169862400. Its totient is φ = 7570938880.

The previous prime is 31230133423. The next prime is 31230133463. The reversal of 31230133440 is 4433103213.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 31230133440.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1468140 + ... + 1489259.

Almost surely, 2^31230133440 is an apocalyptic number.

31230133440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31230133440 is an abundant number, since it is smaller than the sum of its proper divisors (76939728960).

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

31230133440 is a wasteful number, since it uses less digits than its factorization.

31230133440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2957430 (or 2957420 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 31230133440 its reverse (4433103213), we get a palindrome (35663236653).

The spelling of 31230133440 in words is "thirty-one billion, two hundred thirty million, one hundred thirty-three thousand, four hundred forty".