28081634218 has 16 divisors (see below), whose sum is σ = 46730610720. Its totient is φ = 12548033200.

The previous prime is 28081634209. The next prime is 28081634279. The reversal of 28081634218 is 81243618082.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10815973 + ... + 10818568.

It is an arithmetic number, because the mean of its divisors is an integer number (2920663170).

Almost surely, 2^28081634218 is an apocalyptic number.

28081634218 is a deficient number, since it is larger than the sum of its proper divisors (18648976502).

28081634218 is a wasteful number, since it uses less digits than its factorization.

28081634218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21634613.

The product of its (nonzero) digits is 147456, while the sum is 43.

The spelling of 28081634218 in words is "twenty-eight billion, eighty-one million, six hundred thirty-four thousand, two hundred eighteen".