31728857302873 has 8 divisors (see below), whose sum is σ = 31792512988296. Its totient is φ = 31665265180800.

The previous prime is 31728857302859. The next prime is 31728857302889. The reversal of 31728857302873 is 37820375882713.

It can be written as a sum of positive squares in 4 ways, for example, as 4450298242329 + 27278559060544 = 2109573^2 + 5222888^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31728857302873 - 2²⁵ = 31728823748441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31728857302073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14891436 + ... + 16888237.

It is an arithmetic number, because the mean of its divisors is an integer number (3974064123537).

Almost surely, 2^{31728857302873} is an apocalyptic number.

It is an amenable number.

31728857302873 is a deficient number, since it is larger than the sum of its proper divisors (63655685423).

31728857302873 is a wasteful number, since it uses less digits than its factorization.

31728857302873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31781675.

The product of its (nonzero) digits is 94832640, while the sum is 64.

The spelling of 31728857302873 in words is "thirty-one trillion, seven hundred twenty-eight billion, eight hundred fifty-seven million, three hundred two thousand, eight hundred seventy-three".