28273284 has 36 divisors (see below), whose sum is σ = 76967436. Its totient is φ = 8699328.

The previous prime is 28273283. The next prime is 28273309. The reversal of 28273284 is 48237282.

It can be written as a sum of positive squares in 2 ways, for example, as 14745600 + 13527684 = 3840^2 + 3678^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (28273283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29739 + ... + 30674.

Almost surely, 2^28273284 is an apocalyptic number.

It is an amenable number.

28273284 is an abundant number, since it is smaller than the sum of its proper divisors (48694152).

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

28273284 is a wasteful number, since it uses less digits than its factorization.

28273284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60436 (or 60431 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 28273284 is about 5317.2628296897. The cubic root of 28273284 is about 304.6436185009.

The spelling of 28273284 in words is "twenty-eight million, two hundred seventy-three thousand, two hundred eighty-four".