28056124866 has 128 divisors (see below), whose sum is σ = 72387919872. Its totient is φ = 7035336000.

The previous prime is 28056124847. The next prime is 28056124927. The reversal of 28056124866 is 66842165082.

It is a super-2 number, since 2×28056124866² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6628971 + ... + 6633201.

It is an arithmetic number, because the mean of its divisors is an integer number (565530624).

Almost surely, 2^28056124866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28056124866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36193959936).

28056124866 is an abundant number, since it is smaller than the sum of its proper divisors (44331795006).

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

28056124866 is a wasteful number, since it uses less digits than its factorization.

28056124866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4748.

The product of its (nonzero) digits is 1105920, while the sum is 48.

The spelling of 28056124866 in words is "twenty-eight billion, fifty-six million, one hundred twenty-four thousand, eight hundred sixty-six".