28222156 has 12 divisors (see below), whose sum is σ = 49509040. Its totient is φ = 14076720.

The previous prime is 28222153. The next prime is 28222169. The reversal of 28222156 is 65122282.

It is not an unprimeable number, because it can be changed into a prime (28222153) by changing a digit.

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, 6696 + ... + 10063.

Almost surely, 2^28222156 is an apocalyptic number.

It is an amenable number.

28222156 is a deficient number, since it is larger than the sum of its proper divisors (21286884).

28222156 is a wasteful number, since it uses less digits than its factorization.

28222156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17184 (or 17182 counting only the distinct ones).

The product of its digits is 3840, while the sum is 28.

The square root of 28222156 is about 5312.4529174384. The cubic root of 28222156 is about 304.4598735775.

It can be divided in two parts, 2822215 and 6, that multiplied together give a triangular number (16933290 = T₅₈₁₉).

The spelling of 28222156 in words is "twenty-eight million, two hundred twenty-two thousand, one hundred fifty-six".