28663566 has 32 divisors (see below), whose sum is σ = 60963840. Its totient is φ = 8964384.

The previous prime is 28663559. The next prime is 28663603. The reversal of 28663566 is 66536682.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5355 + ... + 9273.

It is an arithmetic number, because the mean of its divisors is an integer number (1905120).

Almost surely, 2^28663566 is an apocalyptic number.

28663566 is an abundant number, since it is smaller than the sum of its proper divisors (32300274).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28663566 is a wasteful number, since it uses less digits than its factorization.

28663566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4000.

The product of its digits is 311040, while the sum is 42.

The square root of 28663566 is about 5353.8365682938. The cubic root of 28663566 is about 306.0389757693.

The spelling of 28663566 in words is "twenty-eight million, six hundred sixty-three thousand, five hundred sixty-six".