28912808 has 8 divisors (see below), whose sum is σ = 54211530. Its totient is φ = 14456400.

The previous prime is 28912789. The next prime is 28912811. The reversal of 28912808 is 80821982.

It can be written as a sum of positive squares in only one way, i.e., 27269284 + 1643524 = 5222^2 + 1282^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1807043 + ... + 1807058.

Almost surely, 2^28912808 is an apocalyptic number.

It is an amenable number.

28912808 is a deficient number, since it is larger than the sum of its proper divisors (25298722).

28912808 is a wasteful number, since it uses less digits than its factorization.

28912808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3614107 (or 3614103 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 28912808 is about 5377.0631389263. The cubic root of 28912808 is about 306.9234637518.

The spelling of 28912808 in words is "twenty-eight million, nine hundred twelve thousand, eight hundred eight".