285506880 has 56 divisors (see below), whose sum is σ = 906487392. Its totient is φ = 76134912.

The previous prime is 285506831. The next prime is 285506909. The reversal of 285506880 is 88605582.

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, 147742 + ... + 149661.

Almost surely, 2^285506880 is an apocalyptic number.

285506880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

285506880 is an abundant number, since it is smaller than the sum of its proper divisors (620980512).

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

285506880 is a wasteful number, since it uses less digits than its factorization.

285506880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297423 (or 297413 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 42.

The square root of 285506880 is about 16896.9488369942. The cubic root of 285506880 is about 658.4743456237.

The spelling of 285506880 in words is "two hundred eighty-five million, five hundred six thousand, eight hundred eighty".