285866490 has 128 divisors (see below), whose sum is σ = 862041600. Its totient is φ = 60286464.

The previous prime is 285866489. The next prime is 285866527. The reversal of 285866490 is 94668582.

It is a happy number.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 132702 + ... + 134838.

It is an arithmetic number, because the mean of its divisors is an integer number (6734700).

Almost surely, 2^285866490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 285866490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (431020800).

285866490 is an abundant number, since it is smaller than the sum of its proper divisors (576175110).

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

285866490 is a wasteful number, since it uses less digits than its factorization.

285866490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2181 (or 2167 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 48.

The square root of 285866490 is about 16907.5867586122. The cubic root of 285866490 is about 658.7506899404.

The spelling of 285866490 in words is "two hundred eighty-five million, eight hundred sixty-six thousand, four hundred ninety".