31994636544 has 324 divisors, whose sum is σ = 100832449536. Its totient is φ = 9751891968.

The previous prime is 31994636539. The next prime is 31994636551. The reversal of 31994636544 is 44563649913.

It is a happy number.

31994636544 is a `hidden beast` number, since 3 + 1 + 9 + 94 + 6 + 3 + 6 + 544 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 49450429 + ... + 49451075.

It is an arithmetic number, because the mean of its divisors is an integer number (311211264).

Almost surely, 2^31994636544 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 31994636544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50416224768).

31994636544 is an abundant number, since it is smaller than the sum of its proper divisors (68837812992).

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

31994636544 is a wasteful number, since it uses less digits than its factorization.

31994636544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822 (or 792 counting only the distinct ones).

The product of its digits is 8398080, while the sum is 54.

The spelling of 31994636544 in words is "thirty-one billion, nine hundred ninety-four million, six hundred thirty-six thousand, five hundred forty-four".