28804639818 has 32 divisors (see below), whose sum is σ = 59607806400. Its totient is φ = 9268592256.

The previous prime is 28804639777. The next prime is 28804639849. The reversal of 28804639818 is 81893640882.

It is a super-2 number, since 2×28804639818² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1043073 + ... + 1070331.

It is an arithmetic number, because the mean of its divisors is an integer number (1862743950).

Almost surely, 2^28804639818 is an apocalyptic number.

28804639818 is an abundant number, since it is smaller than the sum of its proper divisors (30803166582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28804639818 is a wasteful number, since it uses less digits than its factorization.

28804639818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33366.

The product of its (nonzero) digits is 5308416, while the sum is 57.

The spelling of 28804639818 in words is "twenty-eight billion, eight hundred four million, six hundred thirty-nine thousand, eight hundred eighteen".