31689643596 has 72 divisors (see below), whose sum is σ = 80178384384. Its totient is φ = 9737208000.

The previous prime is 31689643571. The next prime is 31689643597. The reversal of 31689643596 is 69534698613.

It is a super-2 number, since 2×31689643596² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31689643597) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1512625 + ... + 1533431.

It is an arithmetic number, because the mean of its divisors is an integer number (1113588672).

Almost surely, 2^31689643596 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31689643596, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40089192192).

31689643596 is an abundant number, since it is smaller than the sum of its proper divisors (48488740788).

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

31689643596 is a wasteful number, since it uses less digits than its factorization.

31689643596 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21591 (or 21576 counting only the distinct ones).

The product of its digits is 25194240, while the sum is 60.

The spelling of 31689643596 in words is "thirty-one billion, six hundred eighty-nine million, six hundred forty-three thousand, five hundred ninety-six".