28861273 has 4 divisors (see below), whose sum is σ = 32984320. Its totient is φ = 24738228.

The previous prime is 28861267. The next prime is 28861277. The reversal of 28861273 is 37216882.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28861273 - 2⁵ = 28861241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28861277) 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 3 ways as a sum of consecutive naturals, for example, 2061513 + ... + 2061526.

It is an arithmetic number, because the mean of its divisors is an integer number (8246080).

Almost surely, 2^28861273 is an apocalyptic number.

It is an amenable number.

28861273 is a deficient number, since it is larger than the sum of its proper divisors (4123047).

28861273 is an equidigital number, since it uses as much as digits as its factorization.

28861273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4123046.

The product of its digits is 32256, while the sum is 37.

The square root of 28861273 is about 5372.2688875372. The cubic root of 28861273 is about 306.7409989683.

The spelling of 28861273 in words is "twenty-eight million, eight hundred sixty-one thousand, two hundred seventy-three".