7666878394 has 24 divisors (see below), whose sum is σ = 13704218388. Its totient is φ = 3205661760.

The previous prime is 7666878377. The next prime is 7666878419. The reversal of 7666878394 is 4938786667.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5955980625 + 1710897769 = 77175^2 + 41363^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 950049 + ... + 958084.

Almost surely, 2^7666878394 is an apocalyptic number.

7666878394 is a deficient number, since it is larger than the sum of its proper divisors (6037339994).

7666878394 is a wasteful number, since it uses less digits than its factorization.

7666878394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1908190 (or 1908183 counting only the distinct ones).

The product of its digits is 73156608, while the sum is 64.

The square root of 7666878394 is about 87560.7126170179. The cubic root of 7666878394 is about 1971.8453847935.

The spelling of 7666878394 in words is "seven billion, six hundred sixty-six million, eight hundred seventy-eight thousand, three hundred ninety-four".