28285661 has 8 divisors (see below), whose sum is σ = 29928000. Its totient is φ = 26658720.

The previous prime is 28285657. The next prime is 28285667. The reversal of 28285661 is 16658282.

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 28285661 - 2² = 28285657 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 (28285667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41 + ... + 7521.

It is an arithmetic number, because the mean of its divisors is an integer number (3741000).

Almost surely, 2^28285661 is an apocalyptic number.

It is an amenable number.

28285661 is a deficient number, since it is larger than the sum of its proper divisors (1642339).

28285661 is a wasteful number, since it uses less digits than its factorization.

28285661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7699.

The product of its digits is 46080, while the sum is 38.

The square root of 28285661 is about 5318.4265530324. The cubic root of 28285661 is about 304.6880659258.

The spelling of 28285661 in words is "twenty-eight million, two hundred eighty-five thousand, six hundred sixty-one".