31431024240 has 160 divisors (see below), whose sum is σ = 121478939136. Its totient is φ = 6531118080.

The previous prime is 31431024239. The next prime is 31431024257. The reversal of 31431024240 is 4242013413.

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 31431024240.

It is a congruent number.

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, 831927 + ... + 868886.

Almost surely, 2^31431024240 is an apocalyptic number.

31431024240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31431024240 is an abundant number, since it is smaller than the sum of its proper divisors (90047914896).

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

31431024240 is a wasteful number, since it uses less digits than its factorization.

31431024240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1700847 (or 1700841 counting only the distinct ones).

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

Adding to 31431024240 its reverse (4242013413), we get a palindrome (35673037653).

The spelling of 31431024240 in words is "thirty-one billion, four hundred thirty-one million, twenty-four thousand, two hundred forty".