28199128 has 8 divisors (see below), whose sum is σ = 52873380. Its totient is φ = 14099560.

The previous prime is 28199117. The next prime is 28199131. The reversal of 28199128 is 82199182.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1762438 + ... + 1762453.

Almost surely, 2^28199128 is an apocalyptic number.

It is an amenable number.

28199128 is a deficient number, since it is larger than the sum of its proper divisors (24674252).

28199128 is a wasteful number, since it uses less digits than its factorization.

28199128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3524897 (or 3524893 counting only the distinct ones).

The product of its digits is 20736, while the sum is 40.

The square root of 28199128 is about 5310.2851147561. The cubic root of 28199128 is about 304.3770425593.

The spelling of 28199128 in words is "twenty-eight million, one hundred ninety-nine thousand, one hundred twenty-eight".