31047805840 has 160 divisors (see below), whose sum is σ = 78107929344. Its totient is φ = 11434967040.

The previous prime is 31047805807. The next prime is 31047805843. The reversal of 31047805840 is 4850874013.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 31047805793 and 31047805802.

It is not an unprimeable number, because it can be changed into a prime (31047805843) 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, 13227547 + ... + 13229893.

Almost surely, 2^31047805840 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 31047805840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39053964672).

31047805840 is an abundant number, since it is smaller than the sum of its proper divisors (47060123504).

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

31047805840 is a wasteful number, since it uses less digits than its factorization.

31047805840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2585 (or 2579 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 40.

The spelling of 31047805840 in words is "thirty-one billion, forty-seven million, eight hundred five thousand, eight hundred forty".