27991547944712 has 64 divisors (see below), whose sum is σ = 57469520865600. Its totient is φ = 12675868957440.

The previous prime is 27991547944697. The next prime is 27991547944729. The reversal of 27991547944712 is 21744974519972.

It is a super-2 number, since 2×27991547944712² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200861714 + ... + 201001022.

It is an arithmetic number, because the mean of its divisors is an integer number (897961263525).

Almost surely, 2^{27991547944712} is an apocalyptic number.

27991547944712 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

27991547944712 is an abundant number, since it is smaller than the sum of its proper divisors (29477972920888).

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

27991547944712 is a wasteful number, since it uses less digits than its factorization.

27991547944712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147846 (or 147842 counting only the distinct ones).

The product of its digits is 320060160, while the sum is 71.

The spelling of 27991547944712 in words is "twenty-seven trillion, nine hundred ninety-one billion, five hundred forty-seven million, nine hundred forty-four thousand, seven hundred twelve".