31728730160 has 20 divisors (see below), whose sum is σ = 73769297808. Its totient is φ = 12691492032.

The previous prime is 31728730141. The next prime is 31728730177. The reversal of 31728730160 is 6103782713.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198304484 + ... + 198304643.

Almost surely, 2^31728730160 is an apocalyptic number.

It is an amenable number.

31728730160 is an abundant number, since it is smaller than the sum of its proper divisors (42040567648).

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

31728730160 is a wasteful number, since it uses less digits than its factorization.

31728730160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396609140 (or 396609134 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 38.

The spelling of 31728730160 in words is "thirty-one billion, seven hundred twenty-eight million, seven hundred thirty thousand, one hundred sixty".