285208861 has 6 divisors (see below), whose sum is σ = 331773630. Its totient is φ = 244464696.

The previous prime is 285208849. The next prime is 285208909. The reversal of 285208861 is 168802582.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 222308100 + 62900761 = 14910^2 + 7931^2 .

It is not a de Polignac number, because 285208861 - 2²¹ = 283111709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285208961) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2910246 + ... + 2910343.

It is an arithmetic number, because the mean of its divisors is an integer number (55295605).

Almost surely, 2^285208861 is an apocalyptic number.

It is an amenable number.

285208861 is a deficient number, since it is larger than the sum of its proper divisors (46564769).

285208861 is an equidigital number, since it uses as much as digits as its factorization.

285208861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5820603 (or 5820596 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 40.

The square root of 285208861 is about 16888.1278121644. The cubic root of 285208861 is about 658.2451553675.

The spelling of 285208861 in words is "two hundred eighty-five million, two hundred eight thousand, eight hundred sixty-one".