31281847974 has 80 divisors (see below), whose sum is σ = 76030175760. Its totient is φ = 9555848640.

The previous prime is 31281847973. The next prime is 31281848057. The reversal of 31281847974 is 47974818213.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 31281847974.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31281847973) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 239304 + ... + 346164.

It is an arithmetic number, because the mean of its divisors is an integer number (950377197).

Almost surely, 2^31281847974 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31281847974, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38015087880).

31281847974 is an abundant number, since it is smaller than the sum of its proper divisors (44748327786).

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

31281847974 is a wasteful number, since it uses less digits than its factorization.

31281847974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107027 (or 107018 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The spelling of 31281847974 in words is "thirty-one billion, two hundred eighty-one million, eight hundred forty-seven thousand, nine hundred seventy-four".