76666666 has 8 divisors (see below), whose sum is σ = 116185860. Its totient is φ = 37938048.

The previous prime is 76666663. The next prime is 76666703. The reversal of 76666666 is 66666667.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 76650025 + 16641 = 8755^2 + 129^2 .

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

76666666 is a modest number, since divided by 66666 gives 766 as remainder.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (76666663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197401 + ... + 197788.

Almost surely, 2^76666666 is an apocalyptic number.

76666666 is a deficient number, since it is larger than the sum of its proper divisors (39519194).

76666666 is a wasteful number, since it uses less digits than its factorization.

76666666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395288.

The product of its digits is 1959552, while the sum is 49.

The square root of 76666666 is about 8755.9503196398. The cubic root of 76666666 is about 424.8172981714.

Subtracting from 76666666 its reverse (66666667), we obtain a palindrome (9999999).

The spelling of 76666666 in words is "seventy-six million, six hundred sixty-six thousand, six hundred sixty-six".