28385222 has 4 divisors (see below), whose sum is σ = 42577836. Its totient is φ = 14192610.

The previous prime is 28385219. The next prime is 28385233. The reversal of 28385222 is 22258382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22258382 = 2 ⋅11129191.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7096304 + ... + 7096307.

It is an arithmetic number, because the mean of its divisors is an integer number (10644459).

Almost surely, 2^28385222 is an apocalyptic number.

28385222 is a deficient number, since it is larger than the sum of its proper divisors (14192614).

28385222 is a wasteful number, since it uses less digits than its factorization.

28385222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14192613.

The product of its digits is 15360, while the sum is 32.

The square root of 28385222 is about 5327.7783362298. The cubic root of 28385222 is about 305.0451317251.

The spelling of 28385222 in words is "twenty-eight million, three hundred eighty-five thousand, two hundred twenty-two".