28852821 has 16 divisors (see below), whose sum is σ = 43228800. Its totient is φ = 19017504.

The previous prime is 28852801. The next prime is 28852841. The reversal of 28852821 is 12825882.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28852801) and next prime (28852841).

It is not a de Polignac number, because 28852821 - 2⁷ = 28852693 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28852801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3601 + ... + 8406.

It is an arithmetic number, because the mean of its divisors is an integer number (2701800).

Almost surely, 2^28852821 is an apocalyptic number.

It is an amenable number.

28852821 is a deficient number, since it is larger than the sum of its proper divisors (14375979).

28852821 is a wasteful number, since it uses less digits than its factorization.

28852821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12105 (or 12099 counting only the distinct ones).

The product of its digits is 20480, while the sum is 36.

The square root of 28852821 is about 5371.4821976806. The cubic root of 28852821 is about 306.7110530953.

The spelling of 28852821 in words is "twenty-eight million, eight hundred fifty-two thousand, eight hundred twenty-one".