381287512806 has 16 divisors (see below), whose sum is σ = 763330810800. Its totient is φ = 126969873408.

The previous prime is 381287512799. The next prime is 381287512819. The reversal of 381287512806 is 608215782183.

It is a super-2 number, since 2×381287512806² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31484491 + ... + 31496598.

It is an arithmetic number, because the mean of its divisors is an integer number (47708175675).

Almost surely, 2^381287512806 is an apocalyptic number.

381287512806 is an abundant number, since it is smaller than the sum of its proper divisors (382043297994).

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

381287512806 is a wasteful number, since it uses less digits than its factorization.

381287512806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62982103.

The product of its (nonzero) digits is 1290240, while the sum is 51.

The spelling of 381287512806 in words is "three hundred eighty-one billion, two hundred eighty-seven million, five hundred twelve thousand, eight hundred six".