28384433280 has 384 divisors, whose sum is σ = 115635686400. Its totient is φ = 6278307840.

The previous prime is 28384433263. The next prime is 28384433309. The reversal of 28384433280 is 8233448382.

28384433280 is a `hidden beast` number, since 283 + 8 + 4 + 43 + 328 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1238566 + ... + 1261274.

It is an arithmetic number, because the mean of its divisors is an integer number (301134600).

Almost surely, 2^28384433280 is an apocalyptic number.

28384433280 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 28384433280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57817843200).

28384433280 is an abundant number, since it is smaller than the sum of its proper divisors (87251253120).

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

28384433280 is a wasteful number, since it uses less digits than its factorization.

28384433280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22772 (or 22757 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 45.

The spelling of 28384433280 in words is "twenty-eight billion, three hundred eighty-four million, four hundred thirty-three thousand, two hundred eighty".