31728715730 has 32 divisors (see below), whose sum is σ = 58511528064. Its totient is φ = 12381134976.

The previous prime is 31728715691. The next prime is 31728715751. The reversal of 31728715730 is 3751782713.

It is a super-2 number, since 2×31728715730² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 309062 + ... + 398718.

It is an arithmetic number, because the mean of its divisors is an integer number (1828485252).

Almost surely, 2^31728715730 is an apocalyptic number.

31728715730 is a deficient number, since it is larger than the sum of its proper divisors (26782812334).

31728715730 is a wasteful number, since it uses less digits than its factorization.

31728715730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90530.

The product of its (nonzero) digits is 246960, while the sum is 44.

The spelling of 31728715730 in words is "thirty-one billion, seven hundred twenty-eight million, seven hundred fifteen thousand, seven hundred thirty".