387666864 has 80 divisors (see below), whose sum is σ = 1198360800. Its totient is φ = 119280384.

The previous prime is 387666833. The next prime is 387666889. The reversal of 387666864 is 468666783.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 387666864.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28899 + ... + 40130.

It is an arithmetic number, because the mean of its divisors is an integer number (14979510).

Almost surely, 2^387666864 is an apocalyptic number.

It is an amenable number.

387666864 is an abundant number, since it is smaller than the sum of its proper divisors (810693936).

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

387666864 is a wasteful number, since it uses less digits than its factorization.

387666864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69059 (or 69047 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 54.

The square root of 387666864 is about 19689.2575786900. The cubic root of 387666864 is about 729.1544999301.

The spelling of 387666864 in words is "three hundred eighty-seven million, six hundred sixty-six thousand, eight hundred sixty-four".