28131236188 has 12 divisors (see below), whose sum is σ = 53705087352. Its totient is φ = 12786925520.

The previous prime is 28131236179. The next prime is 28131236257. The reversal of 28131236188 is 88163213182.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319673095 + ... + 319673182.

It is an arithmetic number, because the mean of its divisors is an integer number (4475423946).

Almost surely, 2^28131236188 is an apocalyptic number.

It is an amenable number.

28131236188 is a deficient number, since it is larger than the sum of its proper divisors (25573851164).

28131236188 is a wasteful number, since it uses less digits than its factorization.

28131236188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639346292 (or 639346290 counting only the distinct ones).

The product of its digits is 110592, while the sum is 43.

The spelling of 28131236188 in words is "twenty-eight billion, one hundred thirty-one million, two hundred thirty-six thousand, one hundred eighty-eight".