76666664 has 16 divisors (see below), whose sum is σ = 147635700. Its totient is φ = 37297152.

The previous prime is 76666663. The next prime is 76666703. The reversal of 76666664 is 46666667.

It can be written as a sum of positive squares in 2 ways, for example, as 74822500 + 1844164 = 8650^2 + 1358^2 .

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129209 + ... + 129800.

Almost surely, 2^76666664 is an apocalyptic number.

76666664 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

It is an amenable number.

76666664 is a deficient number, since it is larger than the sum of its proper divisors (70969036).

76666664 is a wasteful number, since it uses less digits than its factorization.

76666664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259052 (or 259048 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 47.

The square root of 76666664 is about 8755.9502054317. The cubic root of 76666664 is about 424.8172944774.

The spelling of 76666664 in words is "seventy-six million, six hundred sixty-six thousand, six hundred sixty-four".