27991991060 has 24 divisors (see below), whose sum is σ = 64127107296. Its totient is φ = 10178905760.

The previous prime is 27991991033. The next prime is 27991991081. The reversal of 27991991060 is 6019919972.

It is a junction number, because it is equal to n+sod(n) for n = 27991990993 and 27991991011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63617942 + ... + 63618381.

It is an arithmetic number, because the mean of its divisors is an integer number (2671962804).

Almost surely, 2^27991991060 is an apocalyptic number.

27991991060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27991991060 is an abundant number, since it is smaller than the sum of its proper divisors (36135116236).

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

27991991060 is a wasteful number, since it uses less digits than its factorization.

27991991060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127236343 (or 127236341 counting only the distinct ones).

The product of its (nonzero) digits is 551124, while the sum is 53.

The spelling of 27991991060 in words is "twenty-seven billion, nine hundred ninety-one million, nine hundred ninety-one thousand, sixty".