28133408 has 12 divisors (see below), whose sum is σ = 55387710. Its totient is φ = 14066688.

The previous prime is 28133387. The next prime is 28133423. The reversal of 28133408 is 80433182.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21641104 + 6492304 = 4652^2 + 2548^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439553 + ... + 439616.

Almost surely, 2^28133408 is an apocalyptic number.

It is an amenable number.

28133408 is a deficient number, since it is larger than the sum of its proper divisors (27254302).

28133408 is an equidigital number, since it uses as much as digits as its factorization.

28133408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879179 (or 879171 counting only the distinct ones).

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

The square root of 28133408 is about 5304.0935135045. The cubic root of 28133408 is about 304.1404014434.

The spelling of 28133408 in words is "twenty-eight million, one hundred thirty-three thousand, four hundred eight".