385643660 has 24 divisors (see below), whose sum is σ = 810628560. Its totient is φ = 154109504.

The previous prime is 385643641. The next prime is 385643681. The reversal of 385643660 is 66346583.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13487 + ... + 30873.

It is an arithmetic number, because the mean of its divisors is an integer number (33776190).

Almost surely, 2^385643660 is an apocalyptic number.

It is an amenable number.

385643660 is an abundant number, since it is smaller than the sum of its proper divisors (424984900).

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

385643660 is a wasteful number, since it uses less digits than its factorization.

385643660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18505 (or 18503 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 41.

The square root of 385643660 is about 19637.8119962485. The cubic root of 385643660 is about 727.8838194625.

It can be divided in two parts, 38564 and 3660, that added together give a palindrome (42224).

The spelling of 385643660 in words is "three hundred eighty-five million, six hundred forty-three thousand, six hundred sixty".