28408866 has 8 divisors (see below), whose sum is σ = 56817744. Its totient is φ = 9469620.

The previous prime is 28408847. The next prime is 28408867. The reversal of 28408866 is 66880482.

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

28408866 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (28408867) 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, 2367400 + ... + 2367411.

It is an arithmetic number, because the mean of its divisors is an integer number (7102218).

Almost surely, 2^28408866 is an apocalyptic number.

28408866 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.

28408866 is a wasteful number, since it uses less digits than its factorization.

28408866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4734816.

The product of its (nonzero) digits is 147456, while the sum is 42.

The square root of 28408866 is about 5329.9968105056. The cubic root of 28408866 is about 305.1298058961.

The spelling of 28408866 in words is "twenty-eight million, four hundred eight thousand, eight hundred sixty-six".