27777777778 has 8 divisors (see below), whose sum is σ = 41691666672. Its totient is φ = 13880555556.

The previous prime is 27777777773. The next prime is 27777777791. The reversal of 27777777778 is 87777777772.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 27777777778.

It is not an unprimeable number, because it can be changed into a prime (27777777773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4162500 + ... + 4169167.

It is an arithmetic number, because the mean of its divisors is an integer number (5211458334).

Almost surely, 2^27777777778 is an apocalyptic number.

27777777778 is a deficient number, since it is larger than the sum of its proper divisors (13913888894).

27777777778 is a wasteful number, since it uses less digits than its factorization.

27777777778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8333336.

The product of its digits is 645657712, while the sum is 73.

The spelling of 27777777778 in words is "twenty-seven billion, seven hundred seventy-seven million, seven hundred seventy-seven thousand, seven hundred seventy-eight".