28250280 has 96 divisors (see below), whose sum is σ = 92874600. Its totient is φ = 7446528.

The previous prime is 28250273. The next prime is 28250303. The reversal of 28250280 is 8205282.

28250280 is a `hidden beast` number, since 2 + 82 + 502 + 80 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 26193924 + 2056356 = 5118^2 + 1434^2 .

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 23 ways as a sum of consecutive naturals, for example, 34516 + ... + 35324.

Almost surely, 2^28250280 is an apocalyptic number.

28250280 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 28250280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46437300).

28250280 is an abundant number, since it is smaller than the sum of its proper divisors (64624320).

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

28250280 is a wasteful number, since it uses less digits than its factorization.

28250280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923 (or 916 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 28250280 is about 5315.0992464864. The cubic root of 28250280 is about 304.5609736585.

The spelling of 28250280 in words is "twenty-eight million, two hundred fifty thousand, two hundred eighty".