28644969 has 8 divisors (see below), whose sum is σ = 38301120. Its totient is φ = 19042736.

The previous prime is 28644947. The next prime is 28644991. The reversal of 28644969 is 96944682.

It is an interprime number because it is at equal distance from previous prime (28644947) and next prime (28644991).

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 28644969 - 2¹⁷ = 28513897 is a prime.

It is a super-2 number, since 2×28644969² = 1641068498021922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28644569) 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, 12222 + ... + 14375.

It is an arithmetic number, because the mean of its divisors is an integer number (4787640).

Almost surely, 2^28644969 is an apocalyptic number.

It is an amenable number.

28644969 is a deficient number, since it is larger than the sum of its proper divisors (9656151).

28644969 is a wasteful number, since it uses less digits than its factorization.

28644969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26959.

The product of its digits is 746496, while the sum is 48.

The square root of 28644969 is about 5352.0994945909. The cubic root of 28644969 is about 305.9727751421.

The spelling of 28644969 in words is "twenty-eight million, six hundred forty-four thousand, nine hundred sixty-nine".