31720769138 has 8 divisors (see below), whose sum is σ = 47582063280. Its totient is φ = 15860081380.

The previous prime is 31720769111. The next prime is 31720769141. The reversal of 31720769138 is 83196702713.

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

It is a junction number, because it is equal to n+sod(n) for n = 31720769092 and 31720769101.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16433 + ... + 252411.

It is an arithmetic number, because the mean of its divisors is an integer number (5947757910).

Almost surely, 2^31720769138 is an apocalyptic number.

31720769138 is a deficient number, since it is larger than the sum of its proper divisors (15861294142).

31720769138 is a wasteful number, since it uses less digits than its factorization.

31720769138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303192.

The product of its (nonzero) digits is 381024, while the sum is 47.

The spelling of 31720769138 in words is "thirty-one billion, seven hundred twenty million, seven hundred sixty-nine thousand, one hundred thirty-eight".