31217871744 has 384 divisors, whose sum is σ = 98340933600. Its totient is φ = 9842466816.

The previous prime is 31217871719. The next prime is 31217871761. The reversal of 31217871744 is 44717871213.

It is a tau number, because it is divible by the number of its divisors (384).

It is a self number, because there is not a number n which added to its sum of digits gives 31217871744.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 47806522 + ... + 47807174.

Almost surely, 2^31217871744 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 31217871744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49170466800).

31217871744 is an abundant number, since it is smaller than the sum of its proper divisors (67123061856).

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

31217871744 is an equidigital number, since it uses as much as digits as its factorization.

31217871744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764 (or 740 counting only the distinct ones).

The product of its digits is 263424, while the sum is 45.

The spelling of 31217871744 in words is "thirty-one billion, two hundred seventeen million, eight hundred seventy-one thousand, seven hundred forty-four".