28576645 has 4 divisors (see below), whose sum is σ = 34291980. Its totient is φ = 22861312.

The previous prime is 28576621. The next prime is 28576663. The reversal of 28576645 is 54667582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54667582 = 2 ⋅27333791.

It can be written as a sum of positive squares in 2 ways, for example, as 16507969 + 12068676 = 4063^2 + 3474^2 .

It is a cyclic number.

It is not a de Polignac number, because 28576645 - 2¹¹ = 28574597 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2857660 + ... + 2857669.

It is an arithmetic number, because the mean of its divisors is an integer number (8572995).

Almost surely, 2^28576645 is an apocalyptic number.

It is an amenable number.

28576645 is a deficient number, since it is larger than the sum of its proper divisors (5715335).

28576645 is an equidigital number, since it uses as much as digits as its factorization.

28576645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5715334.

The product of its digits is 403200, while the sum is 43.

The square root of 28576645 is about 5345.7127681910. The cubic root of 28576645 is about 305.7293126449.

The spelling of 28576645 in words is "twenty-eight million, five hundred seventy-six thousand, six hundred forty-five".