28397028 has 48 divisors (see below), whose sum is σ = 73979136. Its totient is φ = 8403360.

The previous prime is 28397027. The next prime is 28397053. The reversal of 28397028 is 82079382.

It is not an unprimeable number, because it can be changed into a prime (28397027) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 3175 + ... + 8177.

It is an arithmetic number, because the mean of its divisors is an integer number (1541232).

Almost surely, 2^28397028 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28397028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36989568).

28397028 is an abundant number, since it is smaller than the sum of its proper divisors (45582108).

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

28397028 is a wasteful number, since it uses less digits than its factorization.

28397028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5064 (or 5062 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 28397028 is about 5328.8861875630. The cubic root of 28397028 is about 305.0874173863.

The spelling of 28397028 in words is "twenty-eight million, three hundred ninety-seven thousand, twenty-eight".