28521066 has 32 divisors (see below), whose sum is σ = 65386368. Its totient is φ = 8124480.

The previous prime is 28521037. The next prime is 28521079. The reversal of 28521066 is 66012582.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 in 15 ways as a sum of consecutive naturals, for example, 16876 + ... + 18488.

It is an arithmetic number, because the mean of its divisors is an integer number (2043324).

Almost surely, 2^28521066 is an apocalyptic number.

28521066 is an abundant number, since it is smaller than the sum of its proper divisors (36865302).

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

28521066 is a wasteful number, since it uses less digits than its factorization.

28521066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2046.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 28521066 is about 5340.5117732292. The cubic root of 28521066 is about 305.5309786856.

The spelling of 28521066 in words is "twenty-eight million, five hundred twenty-one thousand, sixty-six".