28222656 has 224 divisors, whose sum is σ = 98316288. Its totient is φ = 6927360.

The previous prime is 28222631. The next prime is 28222681. The reversal of 28222656 is 65622282.

It is an interprime number because it is at equal distance from previous prime (28222631) and next prime (28222681).

It is a tau number, because it is divible by the number of its divisors (224).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 339991 + ... + 340073.

It is an arithmetic number, because the mean of its divisors is an integer number (438912).

Almost surely, 2^28222656 is an apocalyptic number.

It is a pronic number, being equal to 5312×5313.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28222656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49158144).

28222656 is an abundant number, since it is smaller than the sum of its proper divisors (70093632).

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

28222656 is a wasteful number, since it uses less digits than its factorization.

28222656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139 (or 129 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

The square root of 28222656 is about 5312.4999764706. The cubic root of 28222656 is about 304.4616715624.

It can be divided in two parts, 282226 and 56, that added together give a palindrome (282282).

The spelling of 28222656 in words is "twenty-eight million, two hundred twenty-two thousand, six hundred fifty-six".