31748870820 has 96 divisors (see below), whose sum is σ = 89453548800. Its totient is φ = 8413511680.

The previous prime is 31748870759. The next prime is 31748870831. The reversal of 31748870820 is 2807884713.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 31748870820.

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, 7082980 + ... + 7087460.

It is an arithmetic number, because the mean of its divisors is an integer number (931807800).

Almost surely, 2^31748870820 is an apocalyptic number.

31748870820 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31748870820 is an abundant number, since it is smaller than the sum of its proper divisors (57704677980).

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

31748870820 is a wasteful number, since it uses less digits than its factorization.

31748870820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5205 (or 5203 counting only the distinct ones).

The product of its (nonzero) digits is 602112, while the sum is 48.

The spelling of 31748870820 in words is "thirty-one billion, seven hundred forty-eight million, eight hundred seventy thousand, eight hundred twenty".