28004565 has 8 divisors (see below), whose sum is σ = 44807328. Its totient is φ = 14935760.

The previous prime is 28004539. The next prime is 28004591. The reversal of 28004565 is 56540082.

It is an interprime number because it is at equal distance from previous prime (28004539) and next prime (28004591).

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

It is not a de Polignac number, because 28004565 - 2⁵ = 28004533 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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 933471 + ... + 933500.

It is an arithmetic number, because the mean of its divisors is an integer number (5600916).

Almost surely, 2^28004565 is an apocalyptic number.

It is an amenable number.

28004565 is a deficient number, since it is larger than the sum of its proper divisors (16802763).

28004565 is a wasteful number, since it uses less digits than its factorization.

28004565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1866979.

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 28004565 is about 5291.9339565040. The cubic root of 28004565 is about 303.6753987059.

The spelling of 28004565 in words is "twenty-eight million, four thousand, five hundred sixty-five".