28319866 has 8 divisors (see below), whose sum is σ = 42546240. Its totient is φ = 14137788.

The previous prime is 28319821. The next prime is 28319867. The reversal of 28319866 is 66891382.

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

It is not an unprimeable number, because it can be changed into a prime (28319867) 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, 9426 + ... + 12061.

It is an arithmetic number, because the mean of its divisors is an integer number (5318280).

Almost surely, 2^28319866 is an apocalyptic number.

28319866 is a deficient number, since it is larger than the sum of its proper divisors (14226374).

28319866 is a wasteful number, since it uses less digits than its factorization.

28319866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22148.

The product of its digits is 124416, while the sum is 43.

The square root of 28319866 is about 5321.6412881742. The cubic root of 28319866 is about 304.8108331607.

The spelling of 28319866 in words is "twenty-eight million, three hundred nineteen thousand, eight hundred sixty-six".