31323132240 has 80 divisors (see below), whose sum is σ = 98044522368. Its totient is φ = 8271733248.

The previous prime is 31323132229. The next prime is 31323132241. The reversal of 31323132240 is 4223132313.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×31323132240² (a number of 22 digits) contains 22 as substring.

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 31323132240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31323132241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 608839 + ... + 658278.

Almost surely, 2^31323132240 is an apocalyptic number.

31323132240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31323132240 is an abundant number, since it is smaller than the sum of its proper divisors (66721390128).

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

31323132240 is a wasteful number, since it uses less digits than its factorization.

31323132240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1267236 (or 1267230 counting only the distinct ones).

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

Adding to 31323132240 its reverse (4223132313), we get a palindrome (35546264553).

The spelling of 31323132240 in words is "thirty-one billion, three hundred twenty-three million, one hundred thirty-two thousand, two hundred forty".