31244023140 has 96 divisors (see below), whose sum is σ = 96281087616. Its totient is φ = 7507261440.

The previous prime is 31244023117. The next prime is 31244023157. The reversal of 31244023140 is 4132044213.

It is a self number, because there is not a number n which added to its sum of digits gives 31244023140.

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, 134887 + ... + 284046.

It is an arithmetic number, because the mean of its divisors is an integer number (1002927996).

Almost surely, 2^31244023140 is an apocalyptic number.

31244023140 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31244023140 is an abundant number, since it is smaller than the sum of its proper divisors (65037064476).

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

31244023140 is a wasteful number, since it uses less digits than its factorization.

31244023140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419069 (or 419067 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 31244023140 its reverse (4132044213), we get a palindrome (35376067353).

The spelling of 31244023140 in words is "thirty-one billion, two hundred forty-four million, twenty-three thousand, one hundred forty".