27800027777778 has 16 divisors (see below), whose sum is σ = 58870647059040. Its totient is φ = 8721577342016.

The previous prime is 27800027777759. The next prime is 27800027777789. The reversal of 27800027777778 is 87777772000872.

It is a Curzon number.

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, 136274645868 + ... + 136274646071.

It is an arithmetic number, because the mean of its divisors is an integer number (3679415441190).

Almost surely, 2^{27800027777778} is an apocalyptic number.

27800027777778 is an abundant number, since it is smaller than the sum of its proper divisors (31070619281262).

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

27800027777778 is a wasteful number, since it uses less digits than its factorization.

27800027777778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272549291961.

The product of its (nonzero) digits is 210827008, while the sum is 69.

The spelling of 27800027777778 in words is "twenty-seven trillion, eight hundred billion, twenty-seven million, seven hundred seventy-seven thousand, seven hundred seventy-eight".