285222779 has 4 divisors (see below), whose sum is σ = 286972776. Its totient is φ = 283472784.

The previous prime is 285222739. The next prime is 285222797. The reversal of 285222779 is 977222582.

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 285222779 - 2²⁴ = 268445563 is a prime.

It is a super-3 number, since 3×285222779³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285222739) 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, 874754 + ... + 875079.

It is an arithmetic number, because the mean of its divisors is an integer number (71743194).

Almost surely, 2^285222779 is an apocalyptic number.

285222779 is a deficient number, since it is larger than the sum of its proper divisors (1749997).

285222779 is a wasteful number, since it uses less digits than its factorization.

285222779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1749996.

The product of its digits is 282240, while the sum is 44.

The square root of 285222779 is about 16888.5398717592. The cubic root of 285222779 is about 658.2558624998.

The spelling of 285222779 in words is "two hundred eighty-five million, two hundred twenty-two thousand, seven hundred seventy-nine".