285207661 has 4 divisors (see below), whose sum is σ = 285789024. Its totient is φ = 284626300.

The previous prime is 285207653. The next prime is 285207667. The reversal of 285207661 is 166702582.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 285207661 - 2³ = 285207653 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 285207661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285207667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 289945 + ... + 290926.

It is an arithmetic number, because the mean of its divisors is an integer number (71447256).

Almost surely, 2^285207661 is an apocalyptic number.

It is an amenable number.

285207661 is a deficient number, since it is larger than the sum of its proper divisors (581363).

285207661 is an equidigital number, since it uses as much as digits as its factorization.

285207661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581362.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 285207661 is about 16888.0922842102. The cubic root of 285207661 is about 658.2442321899.

The spelling of 285207661 in words is "two hundred eighty-five million, two hundred seven thousand, six hundred sixty-one".