28536869 has 4 divisors (see below), whose sum is σ = 28701996. Its totient is φ = 28371744.

The previous prime is 28536857. The next prime is 28536881. The reversal of 28536869 is 96863582.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (28536857) and next prime (28536881).

It can be written as a sum of positive squares in 2 ways, for example, as 20340100 + 8196769 = 4510^2 + 2863^2 .

It is a cyclic number.

It is not a de Polignac number, because 28536869 - 2⁴ = 28536853 is a prime.

It is a super-2 number, since 2×28536869² = 1628705784646322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28536889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82304 + ... + 82649.

It is an arithmetic number, because the mean of its divisors is an integer number (7175499).

Almost surely, 2^28536869 is an apocalyptic number.

It is an amenable number.

28536869 is a deficient number, since it is larger than the sum of its proper divisors (165127).

28536869 is a wasteful number, since it uses less digits than its factorization.

28536869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165126.

The product of its digits is 622080, while the sum is 47.

The square root of 28536869 is about 5341.9911081918. The cubic root of 28536869 is about 305.5873979720.

The spelling of 28536869 in words is "twenty-eight million, five hundred thirty-six thousand, eight hundred sixty-nine".