27975993978 has 16 divisors (see below), whose sum is σ = 55955409120. Its totient is φ = 9324761136.

The previous prime is 27975993977. The next prime is 27975994009. The reversal of 27975993978 is 87939957972.

It is not an unprimeable number, because it can be changed into a prime (27975993977) 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, 29325 + ... + 238352.

It is an arithmetic number, because the mean of its divisors is an integer number (3497213070).

Almost surely, 2^27975993978 is an apocalyptic number.

27975993978 is an abundant number, since it is smaller than the sum of its proper divisors (27979415142).

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

27975993978 is a wasteful number, since it uses less digits than its factorization.

27975993978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285101.

The product of its digits is 540101520, while the sum is 75.

The spelling of 27975993978 in words is "twenty-seven billion, nine hundred seventy-five million, nine hundred ninety-three thousand, nine hundred seventy-eight".