28288663 has 16 divisors (see below), whose sum is σ = 33959520. Its totient is φ = 23279616.

The previous prime is 28288657. The next prime is 28288679. The reversal of 28288663 is 36688282.

It is a cyclic number.

It is not a de Polignac number, because 28288663 - 2¹³ = 28280471 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 (28288163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 831 + ... + 7567.

It is an arithmetic number, because the mean of its divisors is an integer number (2122470).

Almost surely, 2^28288663 is an apocalyptic number.

28288663 is a deficient number, since it is larger than the sum of its proper divisors (5670857).

28288663 is a wasteful number, since it uses less digits than its factorization.

28288663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6786.

The product of its digits is 221184, while the sum is 43.

The square root of 28288663 is about 5318.7087718731. The cubic root of 28288663 is about 304.6988445463.

The spelling of 28288663 in words is "twenty-eight million, two hundred eighty-eight thousand, six hundred sixty-three".