28375345 has 4 divisors (see below), whose sum is σ = 34050420. Its totient is φ = 22700272.

The previous prime is 28375343. The next prime is 28375349. The reversal of 28375345 is 54357382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54357382 = 2 ⋅27178691.

It can be written as a sum of positive squares in 2 ways, for example, as 16548624 + 11826721 = 4068^2 + 3439^2 .

It is a cyclic number.

It is not a de Polignac number, because 28375345 - 2¹ = 28375343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28375343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2837530 + ... + 2837539.

It is an arithmetic number, because the mean of its divisors is an integer number (8512605).

Almost surely, 2^28375345 is an apocalyptic number.

It is an amenable number.

28375345 is a deficient number, since it is larger than the sum of its proper divisors (5675075).

28375345 is an equidigital number, since it uses as much as digits as its factorization.

28375345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5675074.

The product of its digits is 100800, while the sum is 37.

The square root of 28375345 is about 5326.8513213718. The cubic root of 28375345 is about 305.0097461725.

The spelling of 28375345 in words is "twenty-eight million, three hundred seventy-five thousand, three hundred forty-five".