31686273504 has 144 divisors (see below), whose sum is σ = 92207239488. Its totient is φ = 10316906496.

The previous prime is 31686273467. The next prime is 31686273517. The reversal of 31686273504 is 40537268613.

31686273504 is a `hidden beast` number, since 3 + 16 + 8 + 62 + 73 + 504 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a self number, because there is not a number n which added to its sum of digits gives 31686273504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7808244 + ... + 7812300.

It is an arithmetic number, because the mean of its divisors is an integer number (640328052).

Almost surely, 2^31686273504 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 31686273504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46103619744).

31686273504 is an abundant number, since it is smaller than the sum of its proper divisors (60520965984).

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

31686273504 is a wasteful number, since it uses less digits than its factorization.

31686273504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4697 (or 4686 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The spelling of 31686273504 in words is "thirty-one billion, six hundred eighty-six million, two hundred seventy-three thousand, five hundred four".