285656920 has 32 divisors (see below), whose sum is σ = 644292720. Its totient is φ = 113984640.

The previous prime is 285656911. The next prime is 285656923. The reversal of 285656920 is 29656582.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285656923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8359 + ... + 25321.

Almost surely, 2^285656920 is an apocalyptic number.

285656920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

285656920 is an abundant number, since it is smaller than the sum of its proper divisors (358635800).

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

285656920 is a wasteful number, since it uses less digits than its factorization.

285656920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17395 (or 17391 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 43.

The square root of 285656920 is about 16901.3881086732. The cubic root of 285656920 is about 658.5896728960.

The spelling of 285656920 in words is "two hundred eighty-five million, six hundred fifty-six thousand, nine hundred twenty".