31005836472 has 96 divisors (see below), whose sum is σ = 84040876080. Its totient is φ = 9528330240.

The previous prime is 31005836453. The next prime is 31005836473. The reversal of 31005836472 is 27463850013.

It is a super-2 number, since 2×31005836472² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 31005836472.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31005836473) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3568998 + ... + 3577674.

Almost surely, 2^31005836472 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 31005836472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42020438040).

31005836472 is an abundant number, since it is smaller than the sum of its proper divisors (53035039608).

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

31005836472 is a wasteful number, since it uses less digits than its factorization.

31005836472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9593 (or 9576 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 39.

The spelling of 31005836472 in words is "thirty-one billion, five million, eight hundred thirty-six thousand, four hundred seventy-two".