28788273 has 12 divisors (see below), whose sum is σ = 42597828. Its totient is φ = 18723840.

The previous prime is 28788269. The next prime is 28788307. The reversal of 28788273 is 37288782.

It can be written as a sum of positive squares in 2 ways, for example, as 400689 + 28387584 = 633^2 + 5328^2 .

It is not a de Polignac number, because 28788273 - 2² = 28788269 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28788223) 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, 38640 + ... + 39377.

It is an arithmetic number, because the mean of its divisors is an integer number (3549819).

Almost surely, 2^28788273 is an apocalyptic number.

It is an amenable number.

28788273 is a deficient number, since it is larger than the sum of its proper divisors (13809555).

28788273 is a wasteful number, since it uses less digits than its factorization.

28788273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78064 (or 78061 counting only the distinct ones).

The product of its digits is 301056, while the sum is 45.

The square root of 28788273 is about 5365.4704360382. The cubic root of 28788273 is about 306.4821630930.

The spelling of 28788273 in words is "twenty-eight million, seven hundred eighty-eight thousand, two hundred seventy-three".