28199664 has 60 divisors (see below), whose sum is σ = 81854136. Its totient is φ = 9398592.

The previous prime is 28199663. The next prime is 28199683. The reversal of 28199664 is 46699182.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28199663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 262 + ... + 7514.

Almost surely, 2^28199664 is an apocalyptic number.

28199664 is a gapful number since it is divisible by the number (24) 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 28199664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40927068).

28199664 is an abundant number, since it is smaller than the sum of its proper divisors (53654472).

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

28199664 is an equidigital number, since it uses as much as digits as its factorization.

28199664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7276 (or 7258 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 28199664 is about 5310.3355826162. The cubic root of 28199664 is about 304.3789710476.

The spelling of 28199664 in words is "twenty-eight million, one hundred ninety-nine thousand, six hundred sixty-four".