28656445 has 4 divisors (see below), whose sum is σ = 34387740. Its totient is φ = 22925152.

The previous prime is 28656409. The next prime is 28656451. The reversal of 28656445 is 54465682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54465682 = 2 ⋅27232841.

It can be written as a sum of positive squares in 2 ways, for example, as 8916196 + 19740249 = 2986^2 + 4443^2 .

It is a cyclic number.

It is not a de Polignac number, because 28656445 - 2⁷ = 28656317 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 28656398 and 28656407.

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, 2865640 + ... + 2865649.

It is an arithmetic number, because the mean of its divisors is an integer number (8596935).

Almost surely, 2^28656445 is an apocalyptic number.

It is an amenable number.

28656445 is a deficient number, since it is larger than the sum of its proper divisors (5731295).

28656445 is an equidigital number, since it uses as much as digits as its factorization.

28656445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5731294.

The product of its digits is 230400, while the sum is 40.

The square root of 28656445 is about 5353.1714898740. The cubic root of 28656445 is about 306.0136301901.

The spelling of 28656445 in words is "twenty-eight million, six hundred fifty-six thousand, four hundred forty-five".