28704400 has 30 divisors (see below), whose sum is σ = 68963282. Its totient is φ = 11481600.

The previous prime is 28704397. The next prime is 28704427. The reversal of 28704400 is 440782.

It can be written as a sum of positive squares in 3 ways, for example, as 952576 + 27751824 = 976^2 + 5268^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35481 + ... + 36280.

Almost surely, 2^28704400 is an apocalyptic number.

28704400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28704400 is an abundant number, since it is smaller than the sum of its proper divisors (40258882).

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

28704400 is a wasteful number, since it uses less digits than its factorization.

28704400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71779 (or 71768 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 28704400 is about 5357.6487380193. The cubic root of 28704400 is about 306.1842341080.

The spelling of 28704400 in words is "twenty-eight million, seven hundred four thousand, four hundred".