28289312 has 24 divisors (see below), whose sum is σ = 57202236. Its totient is φ = 13761792.

The previous prime is 28289281. The next prime is 28289321. The reversal of 28289312 is 21398282.

It can be written as a sum of positive squares in 2 ways, for example, as 22316176 + 5973136 = 4724^2 + 2444^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10763 + ... + 13130.

Almost surely, 2^28289312 is an apocalyptic number.

It is an amenable number.

28289312 is an abundant number, since it is smaller than the sum of its proper divisors (28912924).

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

28289312 is a wasteful number, since it uses less digits than its factorization.

28289312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23940 (or 23932 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 28289312 is about 5318.7697825719. The cubic root of 28289312 is about 304.7011746674.

The spelling of 28289312 in words is "twenty-eight million, two hundred eighty-nine thousand, three hundred twelve".