28928663 has 4 divisors (see below), whose sum is σ = 29113080. Its totient is φ = 28744248.

The previous prime is 28928651. The next prime is 28928677. The reversal of 28928663 is 36682982.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28928663 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 (28928633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91973 + ... + 92286.

It is an arithmetic number, because the mean of its divisors is an integer number (7278270).

Almost surely, 2^28928663 is an apocalyptic number.

28928663 is a deficient number, since it is larger than the sum of its proper divisors (184417).

28928663 is a wasteful number, since it uses less digits than its factorization.

28928663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184416.

The product of its digits is 248832, while the sum is 44.

The square root of 28928663 is about 5378.5372546818. The cubic root of 28928663 is about 306.9795563351.

The spelling of 28928663 in words is "twenty-eight million, nine hundred twenty-eight thousand, six hundred sixty-three".