27981899854786 has 16 divisors (see below), whose sum is σ = 42000659114040. Its totient is φ = 13981682828160.

The previous prime is 27981899854729. The next prime is 27981899854801. The reversal of 27981899854786 is 68745899818972.

It can be written as a sum of positive squares in 4 ways, for example, as 26321876335225 + 1660023519561 = 5130485^2 + 1288419^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 27981899854786.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20340180 + ... + 21672256.

Almost surely, 2^{27981899854786} is an apocalyptic number.

27981899854786 is a deficient number, since it is larger than the sum of its proper divisors (14018759259254).

27981899854786 is a wasteful number, since it uses less digits than its factorization.

27981899854786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1339029.

The product of its digits is 35115171840, while the sum is 91.

The spelling of 27981899854786 in words is "twenty-seven trillion, nine hundred eighty-one billion, eight hundred ninety-nine million, eight hundred fifty-four thousand, seven hundred eighty-six".