28809000660 has 96 divisors (see below), whose sum is σ = 88069169664. Its totient is φ = 6978384000.

The previous prime is 28809000659. The next prime is 28809000721. The reversal of 28809000660 is 6600090882.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 835155 + ... + 868965.

It is an arithmetic number, because the mean of its divisors is an integer number (917387184).

Almost surely, 2^28809000660 is an apocalyptic number.

28809000660 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 28809000660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44034584832).

28809000660 is an abundant number, since it is smaller than the sum of its proper divisors (59260169004).

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

28809000660 is a wasteful number, since it uses less digits than its factorization.

28809000660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35125 (or 35123 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The spelling of 28809000660 in words is "twenty-eight billion, eight hundred nine million, six hundred sixty", and thus it is an aban number.