31143868056 has 288 divisors, whose sum is σ = 100604799360. Its totient is φ = 8675057664.

The previous prime is 31143868051. The next prime is 31143868057. The reversal of 31143868056 is 65086834113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31143868051) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 36087481 + ... + 36088343.

It is an arithmetic number, because the mean of its divisors is an integer number (349322220).

Almost surely, 2^31143868056 is an apocalyptic number.

31143868056 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31143868056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50302399680).

31143868056 is an abundant number, since it is smaller than the sum of its proper divisors (69460931304).

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

31143868056 is a wasteful number, since it uses less digits than its factorization.

31143868056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1135 (or 1121 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 31143868056 in words is "thirty-one billion, one hundred forty-three million, eight hundred sixty-eight thousand, fifty-six".