28281300 has 72 divisors (see below), whose sum is σ = 84494592. Its totient is φ = 7296000.

The previous prime is 28281299. The next prime is 28281311. The reversal of 28281300 is 318282.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7780 + ... + 10820.

It is an arithmetic number, because the mean of its divisors is an integer number (1173536).

Almost surely, 2^28281300 is an apocalyptic number.

28281300 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 28281300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42247296).

28281300 is an abundant number, since it is smaller than the sum of its proper divisors (56213292).

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

28281300 is a wasteful number, since it uses less digits than its factorization.

28281300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3089 (or 3082 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 28281300 is about 5318.0165475485. The cubic root of 28281300 is about 304.6724064844.

Adding to 28281300 its reverse (318282), we get a palindrome (28599582).

The spelling of 28281300 in words is "twenty-eight million, two hundred eighty-one thousand, three hundred".