31283471720 has 16 divisors (see below), whose sum is σ = 70387811460. Its totient is φ = 12513388672.

The previous prime is 31283471701. The next prime is 31283471771. The reversal of 31283471720 is 2717438213.

It can be written as a sum of positive squares in 2 ways, for example, as 28568436484 + 2715035236 = 169022^2 + 52106^2 .

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 3 ways as a sum of consecutive naturals, for example, 391043357 + ... + 391043436.

Almost surely, 2^31283471720 is an apocalyptic number.

It is an amenable number.

31283471720 is an abundant number, since it is smaller than the sum of its proper divisors (39104339740).

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

31283471720 is a wasteful number, since it uses less digits than its factorization.

31283471720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782086804 (or 782086800 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 38.

The spelling of 31283471720 in words is "thirty-one billion, two hundred eighty-three million, four hundred seventy-one thousand, seven hundred twenty".