28205686080 has 896 divisors, whose sum is σ = 120253109760. Its totient is φ = 6131220480.

The previous prime is 28205686057. The next prime is 28205686099. The reversal of 28205686080 is 8068650282.

28205686080 is a `hidden beast` number, since 2 + 8 + 2 + 0 + 568 + 6 + 0 + 80 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 45713932 + ... + 45714548.

It is an arithmetic number, because the mean of its divisors is an integer number (134211060).

Almost surely, 2^28205686080 is an apocalyptic number.

28205686080 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 28205686080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60126554880).

28205686080 is an abundant number, since it is smaller than the sum of its proper divisors (92047423680).

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

28205686080 is a wasteful number, since it uses less digits than its factorization.

28205686080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704 (or 688 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The spelling of 28205686080 in words is "twenty-eight billion, two hundred five million, six hundred eighty-six thousand, eighty".