28504222 has 8 divisors (see below), whose sum is σ = 44615376. Its totient is φ = 13632432.

The previous prime is 28504219. The next prime is 28504243. The reversal of 28504222 is 22240582.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 309783 + ... + 309874.

It is an arithmetic number, because the mean of its divisors is an integer number (5576922).

Almost surely, 2^28504222 is an apocalyptic number.

28504222 is a deficient number, since it is larger than the sum of its proper divisors (16111154).

28504222 is a wasteful number, since it uses less digits than its factorization.

28504222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619682.

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 28504222 is about 5338.9345379017. The cubic root of 28504222 is about 305.4708199097.

The spelling of 28504222 in words is "twenty-eight million, five hundred four thousand, two hundred twenty-two".