28810816 has 14 divisors (see below), whose sum is σ = 57171590. Its totient is φ = 14405376.

The previous prime is 28810807. The next prime is 28810841. The reversal of 28810816 is 61801882.

It can be written as a sum of positive squares in only one way, i.e., 23970816 + 4840000 = 4896^2 + 2200^2 .

It is a super-3 number, since 3×28810816³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 225021 + ... + 225148.

It is an arithmetic number, because the mean of its divisors is an integer number (4083685).

Almost surely, 2^28810816 is an apocalyptic number.

It is an amenable number.

28810816 is a deficient number, since it is larger than the sum of its proper divisors (28360774).

28810816 is an equidigital number, since it uses as much as digits as its factorization.

28810816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450181 (or 450171 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 34.

The square root of 28810816 is about 5367.5707727053. The cubic root of 28810816 is about 306.5621403901.

The spelling of 28810816 in words is "twenty-eight million, eight hundred ten thousand, eight hundred sixteen".