28506915066 has 64 divisors (see below), whose sum is σ = 67323488256. Its totient is φ = 7878561600.

The previous prime is 28506915049. The next prime is 28506915077. The reversal of 28506915066 is 66051960582.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67861 + ... + 248231.

It is an arithmetic number, because the mean of its divisors is an integer number (1051929504).

Almost surely, 2^28506915066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28506915066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33661744128).

28506915066 is an abundant number, since it is smaller than the sum of its proper divisors (38816573190).

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

28506915066 is a wasteful number, since it uses less digits than its factorization.

28506915066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180507.

The product of its (nonzero) digits is 777600, while the sum is 48.

The spelling of 28506915066 in words is "twenty-eight billion, five hundred six million, nine hundred fifteen thousand, sixty-six".