28173893 has 4 divisors (see below), whose sum is σ = 30735168. Its totient is φ = 25612620.

The previous prime is 28173889. The next prime is 28173907. The reversal of 28173893 is 39837182.

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 not a de Polignac number, because 28173893 - 2² = 28173889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28173893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28173833) 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, 1280621 + ... + 1280642.

It is an arithmetic number, because the mean of its divisors is an integer number (7683792).

Almost surely, 2^28173893 is an apocalyptic number.

It is an amenable number.

28173893 is a deficient number, since it is larger than the sum of its proper divisors (2561275).

28173893 is a wasteful number, since it uses less digits than its factorization.

28173893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2561274.

The product of its digits is 72576, while the sum is 41.

The square root of 28173893 is about 5307.9085334998. The cubic root of 28173893 is about 304.2862212285.

The spelling of 28173893 in words is "twenty-eight million, one hundred seventy-three thousand, eight hundred ninety-three".