285990945 has 48 divisors (see below), whose sum is σ = 495714240. Its totient is φ = 140403456.

The previous prime is 285990937. The next prime is 285990959. The reversal of 285990945 is 549099582.

It is not a de Polignac number, because 285990945 - 2³ = 285990937 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 389799 + ... + 390531.

It is an arithmetic number, because the mean of its divisors is an integer number (10327380).

Almost surely, 2^285990945 is an apocalyptic number.

It is an amenable number.

285990945 is a deficient number, since it is larger than the sum of its proper divisors (209723295).

285990945 is a wasteful number, since it uses less digits than its factorization.

285990945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834 (or 797 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 51.

The square root of 285990945 is about 16911.2668064814. The cubic root of 285990945 is about 658.8462740974.

The spelling of 285990945 in words is "two hundred eighty-five million, nine hundred ninety thousand, nine hundred forty-five".