28285663 has 8 divisors (see below), whose sum is σ = 32361120. Its totient is φ = 24218880.

The previous prime is 28285657. The next prime is 28285667. The reversal of 28285663 is 36658282.

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

It is not a de Polignac number, because 28285663 - 2¹³ = 28277471 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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8043 + ... + 11011.

It is an arithmetic number, because the mean of its divisors is an integer number (4045140).

Almost surely, 2^28285663 is an apocalyptic number.

28285663 is a deficient number, since it is larger than the sum of its proper divisors (4075457).

28285663 is a wasteful number, since it uses less digits than its factorization.

28285663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4337.

The product of its digits is 138240, while the sum is 40.

The square root of 28285663 is about 5318.4267410579. The cubic root of 28285663 is about 304.6880731070.

The spelling of 28285663 in words is "twenty-eight million, two hundred eighty-five thousand, six hundred sixty-three".