28188646272 has 64 divisors (see below), whose sum is σ = 83195667600. Its totient is φ = 9396214272.

The previous prime is 28188646267. The next prime is 28188646273. The reversal of 28188646272 is 27264688182.

28188646272 is a `hidden beast` number, since 2 + 8 + 1 + 8 + 8 + 6 + 4 + 627 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28188646273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4074763 + ... + 4081674.

Almost surely, 2^28188646272 is an apocalyptic number.

It is an amenable number.

28188646272 is an abundant number, since it is smaller than the sum of its proper divisors (55007021328).

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

28188646272 is an equidigital number, since it uses as much as digits as its factorization.

28188646272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8156460 (or 8156442 counting only the distinct ones).

The product of its digits is 4128768, while the sum is 54.

The spelling of 28188646272 in words is "twenty-eight billion, one hundred eighty-eight million, six hundred forty-six thousand, two hundred seventy-two".