28280322 has 48 divisors (see below), whose sum is σ = 73719360. Its totient is φ = 7654176.

The previous prime is 28280311. The next prime is 28280327. The reversal of 28280322 is 22308282.

It is a super-2 number, since 2×28280322² = 1599553224847368, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28280327) by changing a digit.

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, 3513 + ... + 8300.

It is an arithmetic number, because the mean of its divisors is an integer number (1535820).

Almost surely, 2^28280322 is an apocalyptic number.

28280322 is an abundant number, since it is smaller than the sum of its proper divisors (45439038).

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

28280322 is a wasteful number, since it uses less digits than its factorization.

28280322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11847 (or 11844 counting only the distinct ones).

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

The square root of 28280322 is about 5317.9245951781. The cubic root of 28280322 is about 304.6688944694.

The spelling of 28280322 in words is "twenty-eight million, two hundred eighty thousand, three hundred twenty-two".