285797640 has 64 divisors (see below), whose sum is σ = 858571200. Its totient is φ = 76108032.

The previous prime is 285797623. The next prime is 285797641. The reversal of 285797640 is 46797582.

It is a self number, because there is not a number n which added to its sum of digits gives 285797640.

It is not an unprimeable number, because it can be changed into a prime (285797641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130071 + ... + 132249.

It is an arithmetic number, because the mean of its divisors is an integer number (13415175).

Almost surely, 2^285797640 is an apocalyptic number.

285797640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

285797640 is an abundant number, since it is smaller than the sum of its proper divisors (572773560).

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

285797640 is a wasteful number, since it uses less digits than its factorization.

285797640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3286 (or 3282 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 48.

The square root of 285797640 is about 16905.5505677869. The cubic root of 285797640 is about 658.6977997180.

The spelling of 285797640 in words is "two hundred eighty-five million, seven hundred ninety-seven thousand, six hundred forty".