38131581852 has 216 divisors, whose sum is σ = 121710091776. Its totient is φ = 9976732416.

The previous prime is 38131581847. The next prime is 38131581869. The reversal of 38131581852 is 25818513183.

38131581852 is a `hidden beast` number, since 3 + 8 + 13 + 1 + 581 + 8 + 52 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 38131581798 and 38131581807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2905818 + ... + 2918910.

Almost surely, 2^38131581852 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 38131581852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60855045888).

38131581852 is an abundant number, since it is smaller than the sum of its proper divisors (83578509924).

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

38131581852 is a wasteful number, since it uses less digits than its factorization.

38131581852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13257 (or 13245 counting only the distinct ones).

The product of its digits is 230400, while the sum is 45.

The spelling of 38131581852 in words is "thirty-eight billion, one hundred thirty-one million, five hundred eighty-one thousand, eight hundred fifty-two".