31857874506 has 64 divisors (see below), whose sum is σ = 75014501760. Its totient is φ = 9987321600.

The previous prime is 31857874493. The next prime is 31857874549. The reversal of 31857874506 is 60547875813.

It is a happy number.

31857874506 is a `hidden beast` number, since 3 + 1 + 8 + 57 + 87 + 4 + 506 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1320060 + ... + 1343976.

It is an arithmetic number, because the mean of its divisors is an integer number (1172101590).

Almost surely, 2^31857874506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31857874506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37507250880).

31857874506 is an abundant number, since it is smaller than the sum of its proper divisors (43156627254).

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

31857874506 is a wasteful number, since it uses less digits than its factorization.

31857874506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25396 (or 25390 counting only the distinct ones).

The product of its (nonzero) digits is 5644800, while the sum is 54.

The spelling of 31857874506 in words is "thirty-one billion, eight hundred fifty-seven million, eight hundred seventy-four thousand, five hundred six".