285015661 has 8 divisors (see below), whose sum is σ = 332663040. Its totient is φ = 239101008.

The previous prime is 285015629. The next prime is 285015667. The reversal of 285015661 is 166510582.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 285015661 - 2⁵ = 285015629 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 (285015667) 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 7 ways as a sum of consecutive naturals, for example, 432826 + ... + 433483.

It is an arithmetic number, because the mean of its divisors is an integer number (41582880).

Almost surely, 2^285015661 is an apocalyptic number.

It is an amenable number.

285015661 is a deficient number, since it is larger than the sum of its proper divisors (47647379).

285015661 is an equidigital number, since it uses as much as digits as its factorization.

285015661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866363.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 285015661 is about 16882.4068485509. The cubic root of 285015661 is about 658.0964904090.

The spelling of 285015661 in words is "two hundred eighty-five million, fifteen thousand, six hundred sixty-one".