27991780262858 has 16 divisors (see below), whose sum is σ = 44201255413920. Its totient is φ = 13258152045936.

The previous prime is 27991780262851. The next prime is 27991780262909. The reversal of 27991780262858 is 85826208719972.

It is not an unprimeable number, because it can be changed into a prime (27991780262851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30437885 + ... + 31344032.

It is an arithmetic number, because the mean of its divisors is an integer number (2762578463370).

Almost surely, 2^{27991780262858} is an apocalyptic number.

27991780262858 is a deficient number, since it is larger than the sum of its proper divisors (16209475151062).

27991780262858 is a wasteful number, since it uses less digits than its factorization.

27991780262858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61793861.

The product of its (nonzero) digits is 487710720, while the sum is 74.

The spelling of 27991780262858 in words is "twenty-seven trillion, nine hundred ninety-one billion, seven hundred eighty million, two hundred sixty-two thousand, eight hundred fifty-eight".