28399422 has 8 divisors (see below), whose sum is σ = 56798856. Its totient is φ = 9466472.

The previous prime is 28399403. The next prime is 28399447. The reversal of 28399422 is 22499382.

It is a happy number.

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

28399422 is an admirable number.

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, 2366613 + ... + 2366624.

It is an arithmetic number, because the mean of its divisors is an integer number (7099857).

Almost surely, 2^28399422 is an apocalyptic number.

28399422 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28399422 is a wasteful number, since it uses less digits than its factorization.

28399422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4733242.

The product of its digits is 62208, while the sum is 39.

The square root of 28399422 is about 5329.1108076301. The cubic root of 28399422 is about 305.0959905693.

The spelling of 28399422 in words is "twenty-eight million, three hundred ninety-nine thousand, four hundred twenty-two".