28399104 has 60 divisors (see below), whose sum is σ = 81975036. Its totient is φ = 9464832.

The previous prime is 28399103. The next prime is 28399109. The reversal of 28399104 is 40199382.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28399103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1527 + ... + 7689.

Almost surely, 2^28399104 is an apocalyptic number.

28399104 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 28399104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40987518).

28399104 is an abundant number, since it is smaller than the sum of its proper divisors (53575932).

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

28399104 is an equidigital number, since it uses as much as digits as its factorization.

28399104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6187 (or 6168 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 28399104 is about 5329.0809714246. The cubic root of 28399104 is about 305.0948518033.

The spelling of 28399104 in words is "twenty-eight million, three hundred ninety-nine thousand, one hundred four".