28223280 has 60 divisors (see below), whose sum is σ = 94785600. Its totient is φ = 7526016.

The previous prime is 28223263. The next prime is 28223311. The reversal of 28223280 is 8232282.

It is a tau number, because it is divible by the number of its divisors (60).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18880 + ... + 20319.

It is an arithmetic number, because the mean of its divisors is an integer number (1579760).

Almost surely, 2^28223280 is an apocalyptic number.

28223280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28223280 is an abundant number, since it is smaller than the sum of its proper divisors (66562320).

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

28223280 is a wasteful number, since it uses less digits than its factorization.

28223280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39218 (or 39209 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 28223280 is about 5312.5587055580. The cubic root of 28223280 is about 304.4639154179.

The spelling of 28223280 in words is "twenty-eight million, two hundred twenty-three thousand, two hundred eighty".