28704000 has 288 divisors, whose sum is σ = 107138304. Its totient is φ = 6758400.

The previous prime is 28703993. The next prime is 28704017. The reversal of 28704000 is 40782.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1247989 + ... + 1248011.

It is an arithmetic number, because the mean of its divisors is an integer number (372008).

Almost surely, 2^28704000 is an apocalyptic number.

28704000 is a gapful number since it is divisible by the number (20) 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 28704000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53569152).

28704000 is an abundant number, since it is smaller than the sum of its proper divisors (78434304).

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

28704000 is a wasteful number, since it uses less digits than its factorization.

28704000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70 (or 46 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 28704000 is about 5357.6114080810. The cubic root of 28704000 is about 306.1828118607.

Adding to 28704000 its reverse (40782), we get a palindrome (28744782).

The spelling of 28704000 in words is "twenty-eight million, seven hundred four thousand".