28220226 has 8 divisors (see below), whose sum is σ = 56440464. Its totient is φ = 9406740.

The previous prime is 28220191. The next prime is 28220273. The reversal of 28220226 is 62202282.

It is a sphenic number, since it is the product of 3 distinct primes.

28220226 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 28220196 and 28220205.

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 3 ways as a sum of consecutive naturals, for example, 2351680 + ... + 2351691.

It is an arithmetic number, because the mean of its divisors is an integer number (7055058).

Almost surely, 2^28220226 is an apocalyptic number.

28220226 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28220226 is a wasteful number, since it uses less digits than its factorization.

28220226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4703376.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 28220226 is about 5312.2712656641. The cubic root of 28220226 is about 304.4529331562.

It can be divided in two parts, 2 and 8220226, that added together give a palindrome (8220228).

The spelling of 28220226 in words is "twenty-eight million, two hundred twenty thousand, two hundred twenty-six".