28666748880 has 720 divisors, whose sum is σ = 125488551552. Its totient is φ = 5953305600.

The previous prime is 28666748867. The next prime is 28666748909. The reversal of 28666748880 is 8884766682.

It is a tau number, because it is divible by the number of its divisors (720).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 16464810 + ... + 16466550.

Almost surely, 2^28666748880 is an apocalyptic number.

28666748880 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 28666748880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62744275776).

28666748880 is an abundant number, since it is smaller than the sum of its proper divisors (96821802672).

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

28666748880 is a wasteful number, since it uses less digits than its factorization.

28666748880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1798 (or 1769 counting only the distinct ones).

The product of its (nonzero) digits is 49545216, while the sum is 63.

The spelling of 28666748880 in words is "twenty-eight billion, six hundred sixty-six million, seven hundred forty-eight thousand, eight hundred eighty".