66788368 has 10 divisors (see below), whose sum is σ = 129402494. Its totient is φ = 33394176.

The previous prime is 66788299. The next prime is 66788369. The reversal of 66788368 is 86388766.

66788368 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 only one way, i.e., 50239744 + 16548624 = 7088^2 + 4068^2 .

It is a super-2 number, since 2×66788368² = 8921372200206848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66788369) 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 as a sum of consecutive naturals, namely, 2087121 + ... + 2087152.

Almost surely, 2^66788368 is an apocalyptic number.

It is an amenable number.

66788368 is a deficient number, since it is larger than the sum of its proper divisors (62614126).

66788368 is a wasteful number, since it uses less digits than its factorization.

66788368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4174281 (or 4174275 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 52.

The square root of 66788368 is about 8172.4150653280. The cubic root of 66788368 is about 405.7267204131.

The spelling of 66788368 in words is "sixty-six million, seven hundred eighty-eight thousand, three hundred sixty-eight".