28434173 has 4 divisors (see below), whose sum is σ = 28445340. Its totient is φ = 28423008.

The previous prime is 28434169. The next prime is 28434179. The reversal of 28434173 is 37143482.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 10903204 + 17530969 = 3302^2 + 4187^2 .

It is a cyclic number.

It is not a de Polignac number, because 28434173 - 2² = 28434169 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28434179) 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, 311 + ... + 7547.

It is an arithmetic number, because the mean of its divisors is an integer number (7111335).

Almost surely, 2^28434173 is an apocalyptic number.

It is an amenable number.

28434173 is a deficient number, since it is larger than the sum of its proper divisors (11167).

28434173 is an equidigital number, since it uses as much as digits as its factorization.

28434173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11166.

The product of its digits is 16128, while the sum is 32.

The square root of 28434173 is about 5332.3702984695. The cubic root of 28434173 is about 305.2203835841.

The spelling of 28434173 in words is "twenty-eight million, four hundred thirty-four thousand, one hundred seventy-three".