28173808208 has 40 divisors (see below), whose sum is σ = 67183699968. Its totient is φ = 11145681792.

The previous prime is 28173808193. The next prime is 28173808261. The reversal of 28173808208 is 80280837182.

It is a congruent 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, 9673616 + ... + 9676527.

Almost surely, 2^28173808208 is an apocalyptic number.

28173808208 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28173808208 is an abundant number, since it is smaller than the sum of its proper divisors (39009891760).

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

28173808208 is a wasteful number, since it uses less digits than its factorization.

28173808208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19350171 (or 19350165 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 47.

The spelling of 28173808208 in words is "twenty-eight billion, one hundred seventy-three million, eight hundred eight thousand, two hundred eight".