28531273 has 8 divisors (see below), whose sum is σ = 29582280. Its totient is φ = 27484800.

The previous prime is 28531271. The next prime is 28531291. The reversal of 28531273 is 37213582.

It can be written as a sum of positive squares in 4 ways, for example, as 2286144 + 26245129 = 1512^2 + 5123^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28531273 - 2¹ = 28531271 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28531271) 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 7 ways as a sum of consecutive naturals, for example, 16611 + ... + 18247.

It is an arithmetic number, because the mean of its divisors is an integer number (3697785).

Almost surely, 2^28531273 is an apocalyptic number.

It is an amenable number.

28531273 is a deficient number, since it is larger than the sum of its proper divisors (1051007).

28531273 is a wasteful number, since it uses less digits than its factorization.

28531273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2267.

The product of its digits is 10080, while the sum is 31.

The square root of 28531273 is about 5341.4673077723. The cubic root of 28531273 is about 305.5674217222.

The spelling of 28531273 in words is "twenty-eight million, five hundred thirty-one thousand, two hundred seventy-three".