28204222 has 4 divisors (see below), whose sum is σ = 42306336. Its totient is φ = 14102110.

The previous prime is 28204219. The next prime is 28204223. The reversal of 28204222 is 22240282.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 28204193 and 28204202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28204223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7051054 + ... + 7051057.

It is an arithmetic number, because the mean of its divisors is an integer number (10576584).

Almost surely, 2^28204222 is an apocalyptic number.

28204222 is a deficient number, since it is larger than the sum of its proper divisors (14102114).

28204222 is a wasteful number, since it uses less digits than its factorization.

28204222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14102113.

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 28204222 is about 5310.7647283607. The cubic root of 28204222 is about 304.3953694062.

The spelling of 28204222 in words is "twenty-eight million, two hundred four thousand, two hundred twenty-two".