28066280 has 64 divisors (see below), whose sum is σ = 69439680. Its totient is φ = 10124800.

The previous prime is 28066273. The next prime is 28066319. The reversal of 28066280 is 8266082.

It is a happy number.

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 15 ways as a sum of consecutive naturals, for example, 99740 + ... + 100020.

It is an arithmetic number, because the mean of its divisors is an integer number (1084995).

Almost surely, 2^28066280 is an apocalyptic number.

28066280 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 28066280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34719840).

28066280 is an abundant number, since it is smaller than the sum of its proper divisors (41373400).

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

28066280 is a wasteful number, since it uses less digits than its factorization.

28066280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530 (or 526 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 28066280 is about 5297.7617915493. The cubic root of 28066280 is about 303.8983097088.

The spelling of 28066280 in words is "twenty-eight million, sixty-six thousand, two hundred eighty".