28226556 has 30 divisors (see below), whose sum is σ = 73790640. Its totient is φ = 9408744.

The previous prime is 28226551. The next prime is 28226563. The reversal of 28226556 is 65562282.

28226556 is a `hidden beast` number, since 2 + 82 + 26 + 556 = 666.

It is a super-2 number, since 2×28226556² = 1593476927242272, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28226556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28226551) 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 9 ways as a sum of consecutive naturals, for example, 43236 + ... + 43883.

It is an arithmetic number, because the mean of its divisors is an integer number (2459688).

Almost surely, 2^28226556 is an apocalyptic number.

It is an amenable number.

28226556 is an abundant number, since it is smaller than the sum of its proper divisors (45564084).

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

28226556 is a wasteful number, since it uses less digits than its factorization.

28226556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87135 (or 87124 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 28226556 is about 5312.8670226159. The cubic root of 28226556 is about 304.4756951165.

It can be divided in two parts, 28226 and 556, that added together give a palindrome (28782).

The spelling of 28226556 in words is "twenty-eight million, two hundred twenty-six thousand, five hundred fifty-six".