28424645 has 4 divisors (see below), whose sum is σ = 34109580. Its totient is φ = 22739712.

The previous prime is 28424639. The next prime is 28424659. The reversal of 28424645 is 54642482.

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 14638276 + 13786369 = 3826^2 + 3713^2 .

It is a cyclic number.

It is not a de Polignac number, because 28424645 - 2¹⁶ = 28359109 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2842460 + ... + 2842469.

It is an arithmetic number, because the mean of its divisors is an integer number (8527395).

Almost surely, 2^28424645 is an apocalyptic number.

It is an amenable number.

28424645 is a deficient number, since it is larger than the sum of its proper divisors (5684935).

28424645 is an equidigital number, since it uses as much as digits as its factorization.

28424645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5684934.

The product of its digits is 61440, while the sum is 35.

The square root of 28424645 is about 5331.4768122913. The cubic root of 28424645 is about 305.1862877011.

The spelling of 28424645 in words is "twenty-eight million, four hundred twenty-four thousand, six hundred forty-five".