28873969 has 4 divisors (see below), whose sum is σ = 28994020. Its totient is φ = 28753920.

The previous prime is 28873967. The next prime is 28873979. The reversal of 28873969 is 96937882.

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 25633969 + 3240000 = 5063^2 + 1800^2 .

It is a cyclic number.

It is not a de Polignac number, because 28873969 - 2¹ = 28873967 is a prime.

It is a super-2 number, since 2×28873969² = 1667412171625922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28873967) 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, 59664 + ... + 60145.

It is an arithmetic number, because the mean of its divisors is an integer number (7248505).

Almost surely, 2^28873969 is an apocalyptic number.

It is an amenable number.

28873969 is a deficient number, since it is larger than the sum of its proper divisors (120051).

28873969 is a wasteful number, since it uses less digits than its factorization.

28873969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120050.

The product of its digits is 1306368, while the sum is 52.

The square root of 28873969 is about 5373.4503812727. The cubic root of 28873969 is about 306.7859705676.

It can be divided in two parts, 288739 and 69, that multiplied together give a palindrome (19922991).

The spelling of 28873969 in words is "twenty-eight million, eight hundred seventy-three thousand, nine hundred sixty-nine".