28304422 has 8 divisors (see below), whose sum is σ = 44954136. Its totient is φ = 13319712.

The previous prime is 28304407. The next prime is 28304429. The reversal of 28304422 is 22440382.

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

It is a super-2 number, since 2×28304422² = 1602280609508168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28304429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 416208 + ... + 416275.

It is an arithmetic number, because the mean of its divisors is an integer number (5619267).

Almost surely, 2^28304422 is an apocalyptic number.

28304422 is a deficient number, since it is larger than the sum of its proper divisors (16649714).

28304422 is a wasteful number, since it uses less digits than its factorization.

28304422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832502.

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 28304422 is about 5320.1900341999. The cubic root of 28304422 is about 304.7554144133.

The spelling of 28304422 in words is "twenty-eight million, three hundred four thousand, four hundred twenty-two".