31858469856 has 192 divisors, whose sum is σ = 96430602240. Its totient is φ = 10222018560.

The previous prime is 31858469827. The next prime is 31858469873. The reversal of 31858469856 is 65896485813.

It is a junction number, because it is equal to n+sod(n) for n = 31858469793 and 31858469802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5166231 + ... + 5172393.

It is an arithmetic number, because the mean of its divisors is an integer number (502242720).

Almost surely, 2^31858469856 is an apocalyptic number.

31858469856 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 31858469856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48215301120).

31858469856 is an abundant number, since it is smaller than the sum of its proper divisors (64572132384).

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

31858469856 is a wasteful number, since it uses less digits than its factorization.

31858469856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6406 (or 6392 counting only the distinct ones).

The product of its digits is 49766400, while the sum is 63.

The spelling of 31858469856 in words is "thirty-one billion, eight hundred fifty-eight million, four hundred sixty-nine thousand, eight hundred fifty-six".