285206890 has 8 divisors (see below), whose sum is σ = 513372420. Its totient is φ = 114082752.

The previous prime is 285206861. The next prime is 285206899. The reversal of 285206890 is 98602582.

It can be written as a sum of positive squares in 2 ways, for example, as 263705121 + 21501769 = 16239^2 + 4637^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (285206899) 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, 14260335 + ... + 14260354.

Almost surely, 2^285206890 is an apocalyptic number.

285206890 is a deficient number, since it is larger than the sum of its proper divisors (228165530).

285206890 is a wasteful number, since it uses less digits than its factorization.

285206890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28520696.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 285206890 is about 16888.0694574602. The cubic root of 285206890 is about 658.2436390469.

The spelling of 285206890 in words is "two hundred eighty-five million, two hundred six thousand, eight hundred ninety".