28051300 has 18 divisors (see below), whose sum is σ = 60871538. Its totient is φ = 11220480.

The previous prime is 28051297. The next prime is 28051327. The reversal of 28051300 is 315082.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 509796 + 27541504 = 714^2 + 5248^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 140157 + ... + 140356.

Almost surely, 2^28051300 is an apocalyptic number.

28051300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28051300 is an abundant number, since it is smaller than the sum of its proper divisors (32820238).

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

28051300 is a wasteful number, since it uses less digits than its factorization.

28051300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280527 (or 280520 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 28051300 is about 5296.3477982474. The cubic root of 28051300 is about 303.8442328730.

Adding to 28051300 its reverse (315082), we get a palindrome (28366382).

The spelling of 28051300 in words is "twenty-eight million, fifty-one thousand, three hundred".