31968157863820 has 24 divisors (see below), whose sum is σ = 67235002758000. Its totient is φ = 12767859099072.

The previous prime is 31968157863751. The next prime is 31968157863839. The reversal of 31968157863820 is 2836875186913.

It is a super-2 number, since 2×31968157863820² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1212739395 + ... + 1212765754.

It is an arithmetic number, because the mean of its divisors is an integer number (2801458448250).

Almost surely, 2^{31968157863820} is an apocalyptic number.

It is an amenable number.

31968157863820 is an abundant number, since it is smaller than the sum of its proper divisors (35266844894180).

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

31968157863820 is a wasteful number, since it uses less digits than its factorization.

31968157863820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2425505817 (or 2425505815 counting only the distinct ones).

The product of its (nonzero) digits is 104509440, while the sum is 67.

The spelling of 31968157863820 in words is "thirty-one trillion, nine hundred sixty-eight billion, one hundred fifty-seven million, eight hundred sixty-three thousand, eight hundred twenty".