28595921 has 8 divisors (see below), whose sum is σ = 30386664. Its totient is φ = 26817280.

The previous prime is 28595909. The next prime is 28595933. The reversal of 28595921 is 12959582.

It is an interprime number because it is at equal distance from previous prime (28595909) and next prime (28595933).

It can be written as a sum of positive squares in 4 ways, for example, as 15171025 + 13424896 = 3895^2 + 3664^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 28595921 - 2¹⁰ = 28594897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28595951) 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 7 ways as a sum of consecutive naturals, for example, 2111 + ... + 7851.

It is an arithmetic number, because the mean of its divisors is an integer number (3798333).

Almost surely, 2^28595921 is an apocalyptic number.

It is an amenable number.

28595921 is a deficient number, since it is larger than the sum of its proper divisors (1790743).

28595921 is a wasteful number, since it uses less digits than its factorization.

28595921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6051.

The product of its digits is 64800, while the sum is 41.

The square root of 28595921 is about 5347.5154043724. The cubic root of 28595921 is about 305.7980390899.

The spelling of 28595921 in words is "twenty-eight million, five hundred ninety-five thousand, nine hundred twenty-one".