31775315137420 has 144 divisors (see below), whose sum is σ = 70039405537920. Its totient is φ = 12107147931648.

The previous prime is 31775315137417. The next prime is 31775315137459. The reversal of 31775315137420 is 2473151357713.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 684096637 + ... + 684143083.

It is an arithmetic number, because the mean of its divisors is an integer number (486384760680).

Almost surely, 2^{31775315137420} 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 31775315137420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35019702768960).

31775315137420 is an abundant number, since it is smaller than the sum of its proper divisors (38264090400500).

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

31775315137420 is a wasteful number, since it uses less digits than its factorization.

31775315137420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47060 (or 47029 counting only the distinct ones).

The product of its (nonzero) digits is 1852200, while the sum is 49.

The spelling of 31775315137420 in words is "thirty-one trillion, seven hundred seventy-five billion, three hundred fifteen million, one hundred thirty-seven thousand, four hundred twenty".