28015300 has 36 divisors (see below), whose sum is σ = 62285076. Its totient is φ = 10931200.

The previous prime is 28015297. The next prime is 28015319. The reversal of 28015300 is 351082.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 9884736 + 18130564 = 3144^2 + 4258^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 684 + ... + 7516.

It is an arithmetic number, because the mean of its divisors is an integer number (1730141).

Almost surely, 2^28015300 is an apocalyptic number.

28015300 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 28015300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31142538).

28015300 is an abundant number, since it is smaller than the sum of its proper divisors (34269776).

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

28015300 is a wasteful number, since it uses less digits than its factorization.

28015300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6888 (or 6881 counting only the distinct ones).

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

The square root of 28015300 is about 5292.9481387975. The cubic root of 28015300 is about 303.7141964156.

Adding to 28015300 its reverse (351082), we get a palindrome (28366382).

The spelling of 28015300 in words is "twenty-eight million, fifteen thousand, three hundred".