28814821 has 8 divisors (see below), whose sum is σ = 32963904. Its totient is φ = 24673920.

The previous prime is 28814809. The next prime is 28814827. The reversal of 28814821 is 12841882.

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 28814821 - 2⁵ = 28814789 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 (28814827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11541 + ... + 13813.

It is an arithmetic number, because the mean of its divisors is an integer number (4120488).

Almost surely, 2^28814821 is an apocalyptic number.

It is an amenable number.

28814821 is a deficient number, since it is larger than the sum of its proper divisors (4149083).

28814821 is a wasteful number, since it uses less digits than its factorization.

28814821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4091.

The product of its digits is 8192, while the sum is 34.

The square root of 28814821 is about 5367.9438335363. The cubic root of 28814821 is about 306.5763448296.

The spelling of 28814821 in words is "twenty-eight million, eight hundred fourteen thousand, eight hundred twenty-one".