28563300 has 144 divisors (see below), whose sum is σ = 93744000. Its totient is φ = 7459200.

The previous prime is 28563287. The next prime is 28563313. The reversal of 28563300 is 336582.

28563300 is a `hidden beast` number, since 28 + 5 + 633 + 0 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (28563287) and next prime (28563313).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 191626 + ... + 191774.

It is an arithmetic number, because the mean of its divisors is an integer number (651000).

Almost surely, 2^28563300 is an apocalyptic number.

28563300 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 28563300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46872000).

28563300 is an abundant number, since it is smaller than the sum of its proper divisors (65180700).

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

28563300 is a wasteful number, since it uses less digits than its factorization.

28563300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243 (or 230 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 28563300 is about 5344.4644259271. The cubic root of 28563300 is about 305.6817144175.

Adding to 28563300 its reverse (336582), we get a palindrome (28899882).

The spelling of 28563300 in words is "twenty-eight million, five hundred sixty-three thousand, three hundred".