27998566980 has 96 divisors (see below), whose sum is σ = 81061478400. Its totient is φ = 7213242240.

The previous prime is 27998566951. The next prime is 27998566987. The reversal of 27998566980 is 8966589972.

It is not an unprimeable number, because it can be changed into a prime (27998566987) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1116621 + ... + 1141419.

It is an arithmetic number, because the mean of its divisors is an integer number (844390400).

Almost surely, 2^27998566980 is an apocalyptic number.

27998566980 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 27998566980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40530739200).

27998566980 is an abundant number, since it is smaller than the sum of its proper divisors (53062911420).

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

27998566980 is a wasteful number, since it uses less digits than its factorization.

27998566980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25449 (or 25447 counting only the distinct ones).

The product of its (nonzero) digits is 117573120, while the sum is 69.

The spelling of 27998566980 in words is "twenty-seven billion, nine hundred ninety-eight million, five hundred sixty-six thousand, nine hundred eighty".