28320399360 has 680 divisors, whose sum is σ = 111905274096. Its totient is φ = 6794772480.

The previous prime is 28320399343. The next prime is 28320399361. The reversal of 28320399360 is 6399302382.

28320399360 is a `hidden beast` number, since 2 + 83 + 203 + 9 + 9 + 360 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28320399361) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 291962832 + ... + 291962928.

Almost surely, 2^28320399360 is an apocalyptic number.

28320399360 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 28320399360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55952637048).

28320399360 is an abundant number, since it is smaller than the sum of its proper divisors (83584874736).

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

28320399360 is an frugal number, since it uses more digits than its factorization.

28320399360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 45.

The spelling of 28320399360 in words is "twenty-eight billion, three hundred twenty million, three hundred ninety-nine thousand, three hundred sixty".