194787668 has 12 divisors (see below), whose sum is σ = 341284020. Its totient is φ = 97277952.

The previous prime is 194787661. The next prime is 194787731. The reversal of 194787668 is 866787491.

194787668 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 2 ways, for example, as 40729924 + 154057744 = 6382^2 + 12412^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194787661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25133 + ... + 31956.

It is an arithmetic number, because the mean of its divisors is an integer number (28440335).

Almost surely, 2^194787668 is an apocalyptic number.

It is an amenable number.

194787668 is a deficient number, since it is larger than the sum of its proper divisors (146496352).

194787668 is a wasteful number, since it uses less digits than its factorization.

194787668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57946 (or 57944 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 56.

The square root of 194787668 is about 13956.6352678574. The cubic root of 194787668 is about 579.6784464159.

The spelling of 194787668 in words is "one hundred ninety-four million, seven hundred eighty-seven thousand, six hundred sixty-eight".