31731574340 has 48 divisors (see below), whose sum is σ = 70396939200. Its totient is φ = 11981146752.

The previous prime is 31731574333. The next prime is 31731574361. The reversal of 31731574340 is 4347513713.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 31731574294 and 31731574303.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45470 + ... + 255989.

It is an arithmetic number, because the mean of its divisors is an integer number (1466602900).

Almost surely, 2^31731574340 is an apocalyptic number.

It is an amenable number.

31731574340 is an abundant number, since it is smaller than the sum of its proper divisors (38665364860).

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

31731574340 is a wasteful number, since it uses less digits than its factorization.

31731574340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301764 (or 301762 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 38.

The spelling of 31731574340 in words is "thirty-one billion, seven hundred thirty-one million, five hundred seventy-four thousand, three hundred forty".