28289322 has 12 divisors (see below), whose sum is σ = 61293570. Its totient is φ = 9429768.

The previous prime is 28289321. The next prime is 28289323. The reversal of 28289322 is 22398282.

It is an interprime number because it is at equal distance from previous prime (28289321) and next prime (28289323).

It can be written as a sum of positive squares in only one way, i.e., 26101881 + 2187441 = 5109^2 + 1479^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28289321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 785797 + ... + 785832.

Almost surely, 2^28289322 is an apocalyptic number.

28289322 is an abundant number, since it is smaller than the sum of its proper divisors (33004248).

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

28289322 is a wasteful number, since it uses less digits than its factorization.

28289322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571637 (or 1571634 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 28289322 is about 5318.7707226388. The cubic root of 28289322 is about 304.7012105704.

The spelling of 28289322 in words is "twenty-eight million, two hundred eighty-nine thousand, three hundred twenty-two".