28399686 has 32 divisors (see below), whose sum is σ = 65318400. Its totient is φ = 8063616.

The previous prime is 28399667. The next prime is 28399691. The reversal of 28399686 is 68699382.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 4990 + ... + 9038.

It is an arithmetic number, because the mean of its divisors is an integer number (2041200).

Almost surely, 2^28399686 is an apocalyptic number.

28399686 is an abundant number, since it is smaller than the sum of its proper divisors (36918714).

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

28399686 is a wasteful number, since it uses less digits than its factorization.

28399686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4228.

The product of its digits is 1119744, while the sum is 51.

The square root of 28399686 is about 5329.1355771832. The cubic root of 28399686 is about 305.0969359535.

The spelling of 28399686 in words is "twenty-eight million, three hundred ninety-nine thousand, six hundred eighty-six".