285255287 has 4 divisors (see below), whose sum is σ = 285879936. Its totient is φ = 284630640.

The previous prime is 285255283. The next prime is 285255319. The reversal of 285255287 is 782552582.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 285255287 - 2² = 285255283 is a prime.

It is a super-2 number, since 2×285255287² = 162741157522904738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285255283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 311639 + ... + 312552.

It is an arithmetic number, because the mean of its divisors is an integer number (71469984).

Almost surely, 2^285255287 is an apocalyptic number.

285255287 is a deficient number, since it is larger than the sum of its proper divisors (624649).

285255287 is an equidigital number, since it uses as much as digits as its factorization.

285255287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624648.

The product of its digits is 448000, while the sum is 44.

The square root of 285255287 is about 16889.5022721216. The cubic root of 285255287 is about 658.2808695823.

The spelling of 285255287 in words is "two hundred eighty-five million, two hundred fifty-five thousand, two hundred eighty-seven".