28861566 has 8 divisors (see below), whose sum is σ = 57723144. Its totient is φ = 9620520.

The previous prime is 28861559. The next prime is 28861579. The reversal of 28861566 is 66516882.

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

28861566 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2405125 + ... + 2405136.

It is an arithmetic number, because the mean of its divisors is an integer number (7215393).

Almost surely, 2^28861566 is an apocalyptic number.

28861566 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28861566 is a wasteful number, since it uses less digits than its factorization.

28861566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4810266.

The product of its digits is 138240, while the sum is 42.

The square root of 28861566 is about 5372.2961571380. The cubic root of 28861566 is about 306.7420369776.

The spelling of 28861566 in words is "twenty-eight million, eight hundred sixty-one thousand, five hundred sixty-six".