194640228778 has 16 divisors (see below), whose sum is σ = 294874183944. Its totient is φ = 96348985600.

The previous prime is 194640228749. The next prime is 194640228817. The reversal of 194640228778 is 877822046491.

194640228778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 186725101689 + 7915127089 = 432117^2 + 88967^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3246126 + ... + 3305542.

Almost surely, 2^194640228778 is an apocalyptic number.

194640228778 is a deficient number, since it is larger than the sum of its proper divisors (100233955166).

194640228778 is a wasteful number, since it uses less digits than its factorization.

194640228778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75737.

The product of its (nonzero) digits is 10838016, while the sum is 58.

The spelling of 194640228778 in words is "one hundred ninety-four billion, six hundred forty million, two hundred twenty-eight thousand, seven hundred seventy-eight".