28166250732156 has 144 divisors (see below), whose sum is σ = 73799754735616. Its totient is φ = 9050565186432.

The previous prime is 28166250732143. The next prime is 28166250732167. The reversal of 28166250732156 is 65123705266182.

28166250732156 is a `hidden beast` number, since 2 + 8 + 1 + 6 + 62 + 507 + 3 + 21 + 56 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 122867715 + ... + 123096741.

Almost surely, 2^{28166250732156} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28166250732156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36899877367808).

28166250732156 is an abundant number, since it is smaller than the sum of its proper divisors (45633504003460).

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

28166250732156 is a wasteful number, since it uses less digits than its factorization.

28166250732156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229928 (or 229923 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 54.

The spelling of 28166250732156 in words is "twenty-eight trillion, one hundred sixty-six billion, two hundred fifty million, seven hundred thirty-two thousand, one hundred fifty-six".