31728425720 has 32 divisors (see below), whose sum is σ = 71401806720. Its totient is φ = 12689086080.

The previous prime is 31728425699. The next prime is 31728425741. The reversal of 31728425720 is 2752482713.

It is an interprime number because it is at equal distance from previous prime (31728425699) and next prime (31728425741).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163154 + ... + 300126.

It is an arithmetic number, because the mean of its divisors is an integer number (2231306460).

Almost surely, 2^31728425720 is an apocalyptic number.

It is an amenable number.

31728425720 is an abundant number, since it is smaller than the sum of its proper divisors (39673381000).

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

31728425720 is a wasteful number, since it uses less digits than its factorization.

31728425720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142775 (or 142771 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 41.

The spelling of 31728425720 in words is "thirty-one billion, seven hundred twenty-eight million, four hundred twenty-five thousand, seven hundred twenty".