285813880 has 32 divisors (see below), whose sum is σ = 701544240. Its totient is φ = 103932160.

The previous prime is 285813833. The next prime is 285813883. The reversal of 285813880 is 88318582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285813883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324349 + ... + 325228.

Almost surely, 2^285813880 is an apocalyptic number.

285813880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

285813880 is an abundant number, since it is smaller than the sum of its proper divisors (415730360).

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

285813880 is a wasteful number, since it uses less digits than its factorization.

285813880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649599 (or 649595 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 43.

The square root of 285813880 is about 16906.0308765837. The cubic root of 285813880 is about 658.7102759695.

The spelling of 285813880 in words is "two hundred eighty-five million, eight hundred thirteen thousand, eight hundred eighty".