28109124666 has 48 divisors (see below), whose sum is σ = 73266897600. Its totient is φ = 7608484224.

The previous prime is 28109124653. The next prime is 28109124689. The reversal of 28109124666 is 66642190182.

It is a super-2 number, since 2×28109124666² (a number of 22 digits) contains 22 as substring.

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 23 ways as a sum of consecutive naturals, for example, 5868351 + ... + 5873138.

It is an arithmetic number, because the mean of its divisors is an integer number (1526393700).

Almost surely, 2^28109124666 is an apocalyptic number.

28109124666 is an abundant number, since it is smaller than the sum of its proper divisors (45157772934).

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

28109124666 is a wasteful number, since it uses less digits than its factorization.

28109124666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11741523 (or 11741520 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 28109124666 in words is "twenty-eight billion, one hundred nine million, one hundred twenty-four thousand, six hundred sixty-six".