381605660 has 24 divisors (see below), whose sum is σ = 827223936. Its totient is φ = 147718080.

The previous prime is 381605659. The next prime is 381605683. The reversal of 381605660 is 66506183.

It is a self number, because there is not a number n which added to its sum of digits gives 381605660.

It is a congruent number.

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, 307127 + ... + 308366.

It is an arithmetic number, because the mean of its divisors is an integer number (34467664).

Almost surely, 2^381605660 is an apocalyptic number.

It is an amenable number.

381605660 is an abundant number, since it is smaller than the sum of its proper divisors (445618276).

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

381605660 is a wasteful number, since it uses less digits than its factorization.

381605660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615533 (or 615531 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 381605660 is about 19534.7295860475. The cubic root of 381605660 is about 725.3343903359.

The spelling of 381605660 in words is "three hundred eighty-one million, six hundred five thousand, six hundred sixty".