28536821 has 8 divisors (see below), whose sum is σ = 29272320. Its totient is φ = 27804672.

The previous prime is 28536797. The next prime is 28536847. The reversal of 28536821 is 12863582.

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 28536821 - 2²² = 24342517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28536881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32636 + ... + 33498.

It is an arithmetic number, because the mean of its divisors is an integer number (3659040).

Almost surely, 2^28536821 is an apocalyptic number.

It is an amenable number.

28536821 is a deficient number, since it is larger than the sum of its proper divisors (735499).

28536821 is an equidigital number, since it uses as much as digits as its factorization.

28536821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1675.

The product of its digits is 23040, while the sum is 35.

The square root of 28536821 is about 5341.9866154830. The cubic root of 28536821 is about 305.5872266357.

The spelling of 28536821 in words is "twenty-eight million, five hundred thirty-six thousand, eight hundred twenty-one".