28170943 has 4 divisors (see below), whose sum is σ = 28199248. Its totient is φ = 28142640.

The previous prime is 28170937. The next prime is 28170953. The reversal of 28170943 is 34907182.

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

It is a cyclic number.

It is not a de Polignac number, because 28170943 - 2¹³ = 28162751 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28170899 and 28170908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28170913) 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, 12603 + ... + 14668.

It is an arithmetic number, because the mean of its divisors is an integer number (7049812).

Almost surely, 2^28170943 is an apocalyptic number.

28170943 is a deficient number, since it is larger than the sum of its proper divisors (28305).

28170943 is a wasteful number, since it uses less digits than its factorization.

28170943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28304.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 28170943 is about 5307.6306389951. The cubic root of 28170943 is about 304.2756005724.

The spelling of 28170943 in words is "twenty-eight million, one hundred seventy thousand, nine hundred forty-three".