381687808 has 96 divisors (see below), whose sum is σ = 852087600. Its totient is φ = 169869312.

The previous prime is 381687781. The next prime is 381687833. The reversal of 381687808 is 808786183.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 661216 + ... + 661792.

Almost surely, 2^381687808 is an apocalyptic number.

381687808 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 381687808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (426043800).

381687808 is an abundant number, since it is smaller than the sum of its proper divisors (470399792).

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

381687808 is a wasteful number, since it uses less digits than its factorization.

381687808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635 (or 615 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 49.

The square root of 381687808 is about 19536.8320871118. The cubic root of 381687808 is about 725.3864340210.

The spelling of 381687808 in words is "three hundred eighty-one million, six hundred eighty-seven thousand, eight hundred eight".