31728174728 has 16 divisors (see below), whose sum is σ = 59492304780. Its totient is φ = 15863560128.

The previous prime is 31728174703. The next prime is 31728174799. The reversal of 31728174728 is 82747182713.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 30039129124 + 1689045604 = 173318^2 + 41098^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 329150 + ... + 414482.

Almost surely, 2^31728174728 is an apocalyptic number.

It is an amenable number.

31728174728 is a deficient number, since it is larger than the sum of its proper divisors (27764130052).

31728174728 is a wasteful number, since it uses less digits than its factorization.

31728174728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131816 (or 131812 counting only the distinct ones).

The product of its digits is 1053696, while the sum is 50.

The spelling of 31728174728 in words is "thirty-one billion, seven hundred twenty-eight million, one hundred seventy-four thousand, seven hundred twenty-eight".