28309224 has 16 divisors (see below), whose sum is σ = 70773120. Its totient is φ = 9436400.

The previous prime is 28309219. The next prime is 28309243. The reversal of 28309224 is 42290382.

It is a junction number, because it is equal to n+sod(n) for n = 28309191 and 28309200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 589752 + ... + 589799.

It is an arithmetic number, because the mean of its divisors is an integer number (4423320).

Almost surely, 2^28309224 is an apocalyptic number.

28309224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28309224 is an abundant number, since it is smaller than the sum of its proper divisors (42463896).

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

28309224 is a wasteful number, since it uses less digits than its factorization.

28309224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1179560 (or 1179556 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 28309224 is about 5320.6413147289. The cubic root of 28309224 is about 304.7726479131.

The spelling of 28309224 in words is "twenty-eight million, three hundred nine thousand, two hundred twenty-four".