28199808 has 192 divisors, whose sum is σ = 100245600. Its totient is φ = 7409664.

The previous prime is 28199807. The next prime is 28199833. The reversal of 28199808 is 80899182.

It is a tau number, because it is divible by the number of its divisors (192).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28199807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 104698 + ... + 104966.

Almost surely, 2^28199808 is an apocalyptic number.

28199808 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28199808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50122800).

28199808 is an abundant number, since it is smaller than the sum of its proper divisors (72045792).

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

28199808 is a wasteful number, since it uses less digits than its factorization.

28199808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309 (or 294 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The square root of 28199808 is about 5310.3491410641. The cubic root of 28199808 is about 304.3794891447.

The spelling of 28199808 in words is "twenty-eight million, one hundred ninety-nine thousand, eight hundred eight".