28220194 has 16 divisors (see below), whose sum is σ = 43124832. Its totient is φ = 13847328.

The previous prime is 28220191. The next prime is 28220273. The reversal of 28220194 is 49102282.

It is not an unprimeable number, because it can be changed into a prime (28220191) 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 7 ways as a sum of consecutive naturals, for example, 40977 + ... + 41659.

It is an arithmetic number, because the mean of its divisors is an integer number (2695302).

Almost surely, 2^28220194 is an apocalyptic number.

28220194 is a deficient number, since it is larger than the sum of its proper divisors (14904638).

28220194 is a wasteful number, since it uses less digits than its factorization.

28220194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 28220194 is about 5312.2682537688. The cubic root of 28220194 is about 304.4528180792.

The spelling of 28220194 in words is "twenty-eight million, two hundred twenty thousand, one hundred ninety-four".