28099828 has 6 divisors (see below), whose sum is σ = 49174706. Its totient is φ = 14049912.

The previous prime is 28099807. The next prime is 28099837. The reversal of 28099828 is 82899082.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 26749584 + 1350244 = 5172^2 + 1162^2 .

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, 3512475 + ... + 3512482.

Almost surely, 2^28099828 is an apocalyptic number.

It is an amenable number.

28099828 is a deficient number, since it is larger than the sum of its proper divisors (21074878).

28099828 is a wasteful number, since it uses less digits than its factorization.

28099828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7024961 (or 7024959 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 46.

The square root of 28099828 is about 5300.9270887270. The cubic root of 28099828 is about 304.0193460680.

The spelling of 28099828 in words is "twenty-eight million, ninety-nine thousand, eight hundred twenty-eight".