31407049856 has 256 divisors, whose sum is σ = 81594777600. Its totient is φ = 11693445120.

The previous prime is 31407049787. The next prime is 31407049859. The reversal of 31407049856 is 65894070413.

It is a self number, because there is not a number n which added to its sum of digits gives 31407049856.

It is not an unprimeable number, because it can be changed into a prime (31407049859) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42270221 + ... + 42270963.

It is an arithmetic number, because the mean of its divisors is an integer number (318729600).

Almost surely, 2^31407049856 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 31407049856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40797388800).

31407049856 is an abundant number, since it is smaller than the sum of its proper divisors (50187727744).

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

31407049856 is a wasteful number, since it uses less digits than its factorization.

31407049856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987 (or 975 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 31407049856 in words is "thirty-one billion, four hundred seven million, forty-nine thousand, eight hundred fifty-six".