28398866 has 8 divisors (see below), whose sum is σ = 42639420. Its totient is φ = 14185728.

The previous prime is 28398847. The next prime is 28398889. The reversal of 28398866 is 66889382.

It can be written as a sum of positive squares in 2 ways, for example, as 28398241 + 625 = 5329^2 + 25^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4031 + ... + 8546.

Almost surely, 2^28398866 is an apocalyptic number.

28398866 is a deficient number, since it is larger than the sum of its proper divisors (14240554).

28398866 is a wasteful number, since it uses less digits than its factorization.

28398866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13708.

The product of its digits is 995328, while the sum is 50.

The square root of 28398866 is about 5329.0586410735. The cubic root of 28398866 is about 305.0939995138.

The spelling of 28398866 in words is "twenty-eight million, three hundred ninety-eight thousand, eight hundred sixty-six".