28117373 has 4 divisors (see below), whose sum is σ = 28877340. Its totient is φ = 27357408.

The previous prime is 28117367. The next prime is 28117379. The reversal of 28117373 is 37371182.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (28117367) and next prime (28117379).

It can be written as a sum of positive squares in 2 ways, for example, as 17081689 + 11035684 = 4133^2 + 3322^2 .

It is a cyclic number.

It is not a de Polignac number, because 28117373 - 2⁴ = 28117357 is a prime.

It is a super-2 number, since 2×28117373² = 1581173328842258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28117379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 379928 + ... + 380001.

It is an arithmetic number, because the mean of its divisors is an integer number (7219335).

Almost surely, 2^28117373 is an apocalyptic number.

It is an amenable number.

28117373 is a deficient number, since it is larger than the sum of its proper divisors (759967).

28117373 is an equidigital number, since it uses as much as digits as its factorization.

28117373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759966.

The product of its digits is 7056, while the sum is 32.

The square root of 28117373 is about 5302.5817296860. The cubic root of 28117373 is about 304.0826075425.

The spelling of 28117373 in words is "twenty-eight million, one hundred seventeen thousand, three hundred seventy-three".