381806568 has 256 divisors, whose sum is σ = 1277337600. Its totient is φ = 104129280.

The previous prime is 381806549. The next prime is 381806599. The reversal of 381806568 is 865608183.

381806568 is a `hidden beast` number, since 3 + 8 + 1 + 80 + 6 + 568 = 666.

381806568 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1451605 + ... + 1451867.

It is an arithmetic number, because the mean of its divisors is an integer number (4989600).

Almost surely, 2^381806568 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 381806568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (638668800).

381806568 is an abundant number, since it is smaller than the sum of its proper divisors (895531032).

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

381806568 is a wasteful number, since it uses less digits than its factorization.

381806568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349 (or 339 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 381806568 is about 19539.8712380609. The cubic root of 381806568 is about 725.4616595132.

The spelling of 381806568 in words is "three hundred eighty-one million, eight hundred six thousand, five hundred sixty-eight".