28049222 has 4 divisors (see below), whose sum is σ = 42073836. Its totient is φ = 14024610.

The previous prime is 28049221. The next prime is 28049257. The reversal of 28049222 is 22294082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22294082 = 2 ⋅11147041.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28049221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7012304 + ... + 7012307.

It is an arithmetic number, because the mean of its divisors is an integer number (10518459).

Almost surely, 2^28049222 is an apocalyptic number.

28049222 is a deficient number, since it is larger than the sum of its proper divisors (14024614).

28049222 is a wasteful number, since it uses less digits than its factorization.

28049222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14024613.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 28049222 is about 5296.1516216966. The cubic root of 28049222 is about 303.8367299063.

The spelling of 28049222 in words is "twenty-eight million, forty-nine thousand, two hundred twenty-two".