28099028 has 24 divisors (see below), whose sum is σ = 53865000. Its totient is φ = 12766208.

The previous prime is 28099009. The next prime is 28099033. The reversal of 28099028 is 82099082.

It can be written as a sum of positive squares in 4 ways, for example, as 10942864 + 17156164 = 3308^2 + 4142^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28098982 and 28099000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5153 + ... + 9096.

It is an arithmetic number, because the mean of its divisors is an integer number (2244375).

Almost surely, 2^28099028 is an apocalyptic number.

It is an amenable number.

28099028 is a deficient number, since it is larger than the sum of its proper divisors (25765972).

28099028 is a wasteful number, since it uses less digits than its factorization.

28099028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14299 (or 14297 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 28099028 is about 5300.8516296912. The cubic root of 28099028 is about 304.0164609046.

The spelling of 28099028 in words is "twenty-eight million, ninety-nine thousand, twenty-eight".