28199308 has 12 divisors (see below), whose sum is σ = 50552712. Its totient is φ = 13755680.

The previous prime is 28199279. The next prime is 28199309. The reversal of 28199308 is 80399182.

It is not an unprimeable number, because it can be changed into a prime (28199309) 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, 85810 + ... + 86137.

It is an arithmetic number, because the mean of its divisors is an integer number (4212726).

Almost surely, 2^28199308 is an apocalyptic number.

It is an amenable number.

28199308 is a deficient number, since it is larger than the sum of its proper divisors (22353404).

28199308 is a wasteful number, since it uses less digits than its factorization.

28199308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171992 (or 171990 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 28199308 is about 5310.3020629716. The cubic root of 28199308 is about 304.3776901887.

The spelling of 28199308 in words is "twenty-eight million, one hundred ninety-nine thousand, three hundred eight".