28421845 has 8 divisors (see below), whose sum is σ = 34145280. Its totient is φ = 22711440.

The previous prime is 28421837. The next prime is 28421849. The reversal of 28421845 is 54812482.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28421845 - 2³ = 28421837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28421845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28421849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2460 + ... + 7930.

It is an arithmetic number, because the mean of its divisors is an integer number (4268160).

Almost surely, 2^28421845 is an apocalyptic number.

It is an amenable number.

28421845 is a deficient number, since it is larger than the sum of its proper divisors (5723435).

28421845 is a wasteful number, since it uses less digits than its factorization.

28421845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6515.

The product of its digits is 20480, while the sum is 34.

The square root of 28421845 is about 5331.2142144168. The cubic root of 28421845 is about 305.1762664717.

The spelling of 28421845 in words is "twenty-eight million, four hundred twenty-one thousand, eight hundred forty-five".