27989716220 has 12 divisors (see below), whose sum is σ = 58778404104. Its totient is φ = 11195886480.

The previous prime is 27989716187. The next prime is 27989716267. The reversal of 27989716220 is 2261798972.

It is a super-2 number, since 2×27989716220² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 699742886 + ... + 699742925.

It is an arithmetic number, because the mean of its divisors is an integer number (4898200342).

Almost surely, 2^27989716220 is an apocalyptic number.

27989716220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27989716220 is an abundant number, since it is smaller than the sum of its proper divisors (30788687884).

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

27989716220 is a wasteful number, since it uses less digits than its factorization.

27989716220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1399485820 (or 1399485818 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 53.

The spelling of 27989716220 in words is "twenty-seven billion, nine hundred eighty-nine million, seven hundred sixteen thousand, two hundred twenty".