28268666880 has 448 divisors, whose sum is σ = 96177908736. Its totient is φ = 7077888000.

The previous prime is 28268666863. The next prime is 28268666917. The reversal of 28268666880 is 8866686282.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

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, 156180390 + ... + 156180570.

It is an arithmetic number, because the mean of its divisors is an integer number (214682832).

Almost surely, 2^28268666880 is an apocalyptic number.

28268666880 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 28268666880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48088954368).

28268666880 is an abundant number, since it is smaller than the sum of its proper divisors (67909241856).

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

28268666880 is a wasteful number, since it uses less digits than its factorization.

28268666880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287 (or 263 counting only the distinct ones).

The product of its (nonzero) digits is 21233664, while the sum is 60.

The spelling of 28268666880 in words is "twenty-eight billion, two hundred sixty-eight million, six hundred sixty-six thousand, eight hundred eighty".