28001312 has 24 divisors (see below), whose sum is σ = 58371516. Its totient is φ = 13176832.

The previous prime is 28001297. The next prime is 28001321. The reversal of 28001312 is 21310082.

It can be written as a sum of positive squares in 2 ways, for example, as 27920656 + 80656 = 5284^2 + 284^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

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, 25193 + ... + 26280.

Almost surely, 2^28001312 is an apocalyptic number.

It is an amenable number.

28001312 is an abundant number, since it is smaller than the sum of its proper divisors (30370204).

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

28001312 is a wasteful number, since it uses less digits than its factorization.

28001312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51500 (or 51492 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 28001312 is about 5291.6265930241. The cubic root of 28001312 is about 303.6636399763.

Adding to 28001312 its reverse (21310082), we get a palindrome (49311394).

The spelling of 28001312 in words is "twenty-eight million, one thousand, three hundred twelve".