28303028 has 48 divisors (see below), whose sum is σ = 57217104. Its totient is φ = 12134400.

The previous prime is 28303021. The next prime is 28303057. The reversal of 28303028 is 82030382.

It can be written as a sum of positive squares in 8 ways, for example, as 21904 + 28281124 = 148^2 + 5318^2 .

It is a super-2 number, since 2×28303028² = 1602122787937568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 28302988 and 28303006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28303021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89126 + ... + 89442.

It is an arithmetic number, because the mean of its divisors is an integer number (1192023).

Almost surely, 2^28303028 is an apocalyptic number.

It is an amenable number.

28303028 is an abundant number, since it is smaller than the sum of its proper divisors (28914076).

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

28303028 is a wasteful number, since it uses less digits than its factorization.

28303028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452 (or 450 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 28303028 is about 5320.0590222290. The cubic root of 28303028 is about 304.7504112372.

The spelling of 28303028 in words is "twenty-eight million, three hundred three thousand, twenty-eight".