28344665 has 8 divisors (see below), whose sum is σ = 34655688. Its totient is φ = 22247680.

The previous prime is 28344649. The next prime is 28344689. The reversal of 28344665 is 56644382.

It can be written as a sum of positive squares in 4 ways, for example, as 2253001 + 26091664 = 1501^2 + 5108^2 .

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

It is not a de Polignac number, because 28344665 - 2⁴ = 28344649 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53216 + ... + 53745.

It is an arithmetic number, because the mean of its divisors is an integer number (4331961).

Almost surely, 2^28344665 is an apocalyptic number.

It is an amenable number.

28344665 is a deficient number, since it is larger than the sum of its proper divisors (6311023).

28344665 is a wasteful number, since it uses less digits than its factorization.

28344665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107019.

The product of its digits is 138240, while the sum is 38.

The square root of 28344665 is about 5323.9707925570. The cubic root of 28344665 is about 304.8997789501.

The spelling of 28344665 in words is "twenty-eight million, three hundred forty-four thousand, six hundred sixty-five".