27989764920 has 256 divisors, whose sum is σ = 106387344000. Its totient is φ = 6484451328.

The previous prime is 27989764909. The next prime is 27989764927. The reversal of 27989764920 is 2946798972.

27989764920 is a `hidden beast` number, since 2 + 79 + 8 + 9 + 76 + 492 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27989764927) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 180046 + ... + 297314.

Almost surely, 2^27989764920 is an apocalyptic number.

27989764920 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 27989764920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53193672000).

27989764920 is an abundant number, since it is smaller than the sum of its proper divisors (78397579080).

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

27989764920 is a wasteful number, since it uses less digits than its factorization.

27989764920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117319 (or 117309 counting only the distinct ones).

The product of its (nonzero) digits is 27433728, while the sum is 63.

The spelling of 27989764920 in words is "twenty-seven billion, nine hundred eighty-nine million, seven hundred sixty-four thousand, nine hundred twenty".