31989189660 has 48 divisors (see below), whose sum is σ = 89578119456. Its totient is φ = 8529651712.

The previous prime is 31989189647. The next prime is 31989189677. The reversal of 31989189660 is 6698198913.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a junction number, because it is equal to n+sod(n) for n = 31989189594 and 31989189603.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 911152 + ... + 945608.

It is an arithmetic number, because the mean of its divisors is an integer number (1866210822).

Almost surely, 2^31989189660 is an apocalyptic number.

31989189660 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31989189660 is an abundant number, since it is smaller than the sum of its proper divisors (57588929796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31989189660 is a wasteful number, since it uses less digits than its factorization.

31989189660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49942 (or 49940 counting only the distinct ones).

The product of its (nonzero) digits is 5038848, while the sum is 60.

The spelling of 31989189660 in words is "thirty-one billion, nine hundred eighty-nine million, one hundred eighty-nine thousand, six hundred sixty".