381181664 has 12 divisors (see below), whose sum is σ = 750451464. Its totient is φ = 190590816.

The previous prime is 381181663. The next prime is 381181681. The reversal of 381181664 is 466181183.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381181663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5955932 + ... + 5955995.

It is an arithmetic number, because the mean of its divisors is an integer number (62537622).

Almost surely, 2^381181664 is an apocalyptic number.

It is an amenable number.

381181664 is a deficient number, since it is larger than the sum of its proper divisors (369269800).

381181664 is a wasteful number, since it uses less digits than its factorization.

381181664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11911937 (or 11911929 counting only the distinct ones).

The product of its digits is 27648, while the sum is 38.

The square root of 381181664 is about 19523.8742057001. The cubic root of 381181664 is about 725.0656549341.

The spelling of 381181664 in words is "three hundred eighty-one million, one hundred eighty-one thousand, six hundred sixty-four".