28626228 has 36 divisors (see below), whose sum is σ = 73086468. Its totient is φ = 9446400.

The previous prime is 28626209. The next prime is 28626239. The reversal of 28626228 is 82262682.

28626228 is a `hidden beast` number, since 2 + 8 + 626 + 2 + 28 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13972644 + 14653584 = 3738^2 + 3828^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28626192 and 28626201.

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 in 11 ways as a sum of consecutive naturals, for example, 301 + ... + 7572.

Almost surely, 2^28626228 is an apocalyptic number.

It is an amenable number.

28626228 is an abundant number, since it is smaller than the sum of its proper divisors (44460240).

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

28626228 is a wasteful number, since it uses less digits than its factorization.

28626228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7984 (or 7979 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 28626228 is about 5350.3483998708. The cubic root of 28626228 is about 305.9060329185.

The spelling of 28626228 in words is "twenty-eight million, six hundred twenty-six thousand, two hundred twenty-eight".