28169345 has 4 divisors (see below), whose sum is σ = 33803220. Its totient is φ = 22535472.

The previous prime is 28169299. The next prime is 28169347. The reversal of 28169345 is 54396182.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13300609 + 14868736 = 3647^2 + 3856^2 .

It is a cyclic number.

It is not a de Polignac number, because 28169345 - 2¹⁶ = 28103809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28169299 and 28169308.

It is not an unprimeable number, because it can be changed into a prime (28169347) 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, 2816930 + ... + 2816939.

It is an arithmetic number, because the mean of its divisors is an integer number (8450805).

Almost surely, 2^28169345 is an apocalyptic number.

It is an amenable number.

28169345 is a deficient number, since it is larger than the sum of its proper divisors (5633875).

28169345 is an equidigital number, since it uses as much as digits as its factorization.

28169345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5633874.

The product of its digits is 51840, while the sum is 38.

The square root of 28169345 is about 5307.4800988793. The cubic root of 28169345 is about 304.2698471074.

It can be divided in two parts, 28 and 169345, that multiplied together give a triangular number (4741660 = T₃₀₇₉).

The spelling of 28169345 in words is "twenty-eight million, one hundred sixty-nine thousand, three hundred forty-five".