27020721798 has 192 divisors, whose sum is σ = 71299065600. Its totient is φ = 7656214608.

The previous prime is 27020721719. The next prime is 27020721817. The reversal of 27020721798 is 89712702072.

27020721798 is a `hidden beast` number, since 270 + 207 + 2 + 179 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 29790861 + ... + 29791767.

It is an arithmetic number, because the mean of its divisors is an integer number (371349300).

Almost surely, 2^27020721798 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27020721798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35649532800).

27020721798 is an abundant number, since it is smaller than the sum of its proper divisors (44278343802).

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

27020721798 is an equidigital number, since it uses as much as digits as its factorization.

27020721798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083 (or 1058 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 45.

The spelling of 27020721798 in words is "twenty-seven billion, twenty million, seven hundred twenty-one thousand, seven hundred ninety-eight".