28566909840 has 240 divisors, whose sum is σ = 103149148032. Its totient is φ = 6521131008.

The previous prime is 28566909829. The next prime is 28566909869. The reversal of 28566909840 is 4890966582.

It is a tau number, because it is divible by the number of its divisors (240).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16075032 + ... + 16076808.

Almost surely, 2^28566909840 is an apocalyptic number.

28566909840 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 28566909840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51574574016).

28566909840 is an abundant number, since it is smaller than the sum of its proper divisors (74582238192).

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

28566909840 is a wasteful number, since it uses less digits than its factorization.

28566909840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3174 (or 3161 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 57.

The spelling of 28566909840 in words is "twenty-eight billion, five hundred sixty-six million, nine hundred nine thousand, eight hundred forty".