31728728754 has 16 divisors (see below), whose sum is σ = 70508286240. Its totient is φ = 10576242900.

The previous prime is 31728728747. The next prime is 31728728771. The reversal of 31728728754 is 45782782713.

31728728754 is a `hidden beast` number, since 31 + 7 + 287 + 287 + 54 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 587569051 = 31728728754 / (3 + 1 + 7 + 2 + 8 + 7 + 2 + 8 + 7 + 5 + 4).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31728728754.

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, 293784472 + ... + 293784579.

It is an arithmetic number, because the mean of its divisors is an integer number (4406767890).

Almost surely, 2^31728728754 is an apocalyptic number.

31728728754 is an abundant number, since it is smaller than the sum of its proper divisors (38779557486).

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

31728728754 is a wasteful number, since it uses less digits than its factorization.

31728728754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587569062 (or 587569056 counting only the distinct ones).

The product of its digits is 5268480, while the sum is 54.

The spelling of 31728728754 in words is "thirty-one billion, seven hundred twenty-eight million, seven hundred twenty-eight thousand, seven hundred fifty-four".