12172644828 has 36 divisors (see below), whose sum is σ = 30822213240. Its totient is φ = 4050628896.

The previous prime is 12172644811. The next prime is 12172644893. The reversal of 12172644828 is 82844627121.

12172644828 is a `hidden beast` number, since 12 + 172 + 6 + 448 + 28 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent 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 11 ways as a sum of consecutive naturals, for example, 266883 + ... + 309146.

It is an arithmetic number, because the mean of its divisors is an integer number (856172590).

Almost surely, 2^12172644828 is an apocalyptic number.

12172644828 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12172644828 is an abundant number, since it is smaller than the sum of its proper divisors (18649568412).

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

12172644828 is a wasteful number, since it uses less digits than its factorization.

12172644828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576626 (or 576621 counting only the distinct ones).

The product of its digits is 344064, while the sum is 45.

The spelling of 12172644828 in words is "twelve billion, one hundred seventy-two million, six hundred forty-four thousand, eight hundred twenty-eight".