31778535472 has 80 divisors (see below), whose sum is σ = 67534115040. Its totient is φ = 14418948096.

The previous prime is 31778535391. The next prime is 31778535479. The reversal of 31778535472 is 27453587713.

It is not an unprimeable number, because it can be changed into a prime (31778535479) 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 15 ways as a sum of consecutive naturals, for example, 6726103 + ... + 6730825.

It is an arithmetic number, because the mean of its divisors is an integer number (844176438).

Almost surely, 2^31778535472 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 31778535472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33767057520).

31778535472 is an abundant number, since it is smaller than the sum of its proper divisors (35755579568).

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

31778535472 is a wasteful number, since it uses less digits than its factorization.

31778535472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5630 (or 5624 counting only the distinct ones).

The product of its digits is 4939200, while the sum is 52.

The spelling of 31778535472 in words is "thirty-one billion, seven hundred seventy-eight million, five hundred thirty-five thousand, four hundred seventy-two".