31312487940 has 24 divisors (see below), whose sum is σ = 87674966400. Its totient is φ = 8349996768.

The previous prime is 31312487917. The next prime is 31312487957. The reversal of 31312487940 is 4978421313.

It is a junction number, because it is equal to n+sod(n) for n = 31312487892 and 31312487901.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260937340 + ... + 260937459.

It is an arithmetic number, because the mean of its divisors is an integer number (3653123600).

Almost surely, 2^31312487940 is an apocalyptic number.

31312487940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31312487940 is an abundant number, since it is smaller than the sum of its proper divisors (56362478460).

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

31312487940 is a wasteful number, since it uses less digits than its factorization.

31312487940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521874811 (or 521874809 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The spelling of 31312487940 in words is "thirty-one billion, three hundred twelve million, four hundred eighty-seven thousand, nine hundred forty".