285255861 has 32 divisors (see below), whose sum is σ = 430963200. Its totient is φ = 166246080.

The previous prime is 285255857. The next prime is 285255863. The reversal of 285255861 is 168552582.

It is not a de Polignac number, because 285255861 - 2² = 285255857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285255863) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 331650 + ... + 332508.

It is an arithmetic number, because the mean of its divisors is an integer number (13467600).

Almost surely, 2^285255861 is an apocalyptic number.

It is an amenable number.

285255861 is a deficient number, since it is larger than the sum of its proper divisors (145707339).

285255861 is a wasteful number, since it uses less digits than its factorization.

285255861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249.

The product of its digits is 192000, while the sum is 42.

The square root of 285255861 is about 16889.5192649169. The cubic root of 285255861 is about 658.2813111201.

The spelling of 285255861 in words is "two hundred eighty-five million, two hundred fifty-five thousand, eight hundred sixty-one".