28399568 has 10 divisors (see below), whose sum is σ = 55024194. Its totient is φ = 14199776.

The previous prime is 28399559. The next prime is 28399589. The reversal of 28399568 is 86599382.

It can be written as a sum of positive squares in only one way, i.e., 25482304 + 2917264 = 5048^2 + 1708^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 887471 + ... + 887502.

Almost surely, 2^28399568 is an apocalyptic number.

It is an amenable number.

28399568 is a deficient number, since it is larger than the sum of its proper divisors (26624626).

28399568 is a wasteful number, since it uses less digits than its factorization.

28399568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1774981 (or 1774975 counting only the distinct ones).

The product of its digits is 933120, while the sum is 50.

The square root of 28399568 is about 5329.1245059578. The cubic root of 28399568 is about 305.0965133961.

The spelling of 28399568 in words is "twenty-eight million, three hundred ninety-nine thousand, five hundred sixty-eight".