28681810560 has 256 divisors, whose sum is σ = 109396224000. Its totient is φ = 7060082688.

The previous prime is 28681810529. The next prime is 28681810571. The reversal of 28681810560 is 6501818682.

28681810560 is a `hidden beast` number, since 2 + 8 + 6 + 8 + 1 + 81 + 0 + 560 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 160801 + ... + 288479.

It is an arithmetic number, because the mean of its divisors is an integer number (427329000).

Almost surely, 2^28681810560 is an apocalyptic number.

28681810560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28681810560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54698112000).

28681810560 is an abundant number, since it is smaller than the sum of its proper divisors (80714413440).

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

28681810560 is a wasteful number, since it uses less digits than its factorization.

28681810560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127720 (or 127702 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The spelling of 28681810560 in words is "twenty-eight billion, six hundred eighty-one million, eight hundred ten thousand, five hundred sixty".