31085797824 has 84 divisors (see below), whose sum is σ = 89387015536. Its totient is φ = 10328767488.

The previous prime is 31085797819. The next prime is 31085797849. The reversal of 31085797824 is 42879758013.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94077 + ... + 266499.

Almost surely, 2^31085797824 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 31085797824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44693507768).

31085797824 is an abundant number, since it is smaller than the sum of its proper divisors (58301217712).

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

31085797824 is a wasteful number, since it uses less digits than its factorization.

31085797824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172754 (or 172741 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 54.

The spelling of 31085797824 in words is "thirty-one billion, eighty-five million, seven hundred ninety-seven thousand, eight hundred twenty-four".