28166426187 has 8 divisors (see below), whose sum is σ = 37559291904. Its totient is φ = 18775588968.

The previous prime is 28166426143. The next prime is 28166426203. The reversal of 28166426187 is 78162466182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28166426187 - 2¹⁹ = 28165901899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28166426137) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 474423 + ... + 530480.

It is an arithmetic number, because the mean of its divisors is an integer number (4694911488).

Almost surely, 2^28166426187 is an apocalyptic number.

28166426187 is a deficient number, since it is larger than the sum of its proper divisors (9392865717).

28166426187 is a wasteful number, since it uses less digits than its factorization.

28166426187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014249.

The product of its digits is 1548288, while the sum is 51.

The spelling of 28166426187 in words is "twenty-eight billion, one hundred sixty-six million, four hundred twenty-six thousand, one hundred eighty-seven".