31728019081636 has 48 divisors (see below), whose sum is σ = 55976343865344. Its totient is φ = 15735290996736.

The previous prime is 31728019081597. The next prime is 31728019081637. The reversal of 31728019081636 is 63618091082713.

It is not an unprimeable number, because it can be changed into a prime (31728019081637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 961817535 + ... + 961850521.

It is an arithmetic number, because the mean of its divisors is an integer number (1166173830528).

Almost surely, 2^{31728019081636} is an apocalyptic number.

It is an amenable number.

31728019081636 is a deficient number, since it is larger than the sum of its proper divisors (24248324783708).

31728019081636 is a wasteful number, since it uses less digits than its factorization.

31728019081636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36820 (or 36818 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 31728019081636 in words is "thirty-one trillion, seven hundred twenty-eight billion, nineteen million, eighty-one thousand, six hundred thirty-six".