28163387639808 has 192 divisors, whose sum is σ = 83475403502400. Its totient is φ = 9382315622400.

The previous prime is 28163387639749. The next prime is 28163387639809. The reversal of 28163387639808 is 80893678336182.

It is a happy number.

28163387639808 is a `hidden beast` number, since 2 + 8 + 163 + 3 + 8 + 76 + 398 + 0 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (28163387639809) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 95127208 + ... + 95422808.

It is an arithmetic number, because the mean of its divisors is an integer number (434767726575).

Almost surely, 2^{28163387639808} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28163387639808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41737701751200).

28163387639808 is an abundant number, since it is smaller than the sum of its proper divisors (55312015862592).

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

28163387639808 is a wasteful number, since it uses less digits than its factorization.

28163387639808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297355 (or 297329 counting only the distinct ones).

The product of its (nonzero) digits is 501645312, while the sum is 72.

The spelling of 28163387639808 in words is "twenty-eight trillion, one hundred sixty-three billion, three hundred eighty-seven million, six hundred thirty-nine thousand, eight hundred eight".