28004969 has 4 divisors (see below), whose sum is σ = 28125396. Its totient is φ = 27884544.

The previous prime is 28004959. The next prime is 28004971. The reversal of 28004969 is 96940082.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4840000 + 23164969 = 2200^2 + 4813^2 .

It is a cyclic number.

It is not a de Polignac number, because 28004969 - 2⁴ = 28004953 is a prime.

It is a super-2 number, since 2×28004969² = 1568556577381922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28004909) 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 3 ways as a sum of consecutive naturals, for example, 59864 + ... + 60329.

It is an arithmetic number, because the mean of its divisors is an integer number (7031349).

Almost surely, 2^28004969 is an apocalyptic number.

It is an amenable number.

28004969 is a deficient number, since it is larger than the sum of its proper divisors (120427).

28004969 is a wasteful number, since it uses less digits than its factorization.

28004969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120426.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 28004969 is about 5291.9721276666. The cubic root of 28004969 is about 303.6768589948.

The spelling of 28004969 in words is "twenty-eight million, four thousand, nine hundred sixty-nine".