66388378 has 8 divisors (see below), whose sum is σ = 113808672. Its totient is φ = 28452156.

The previous prime is 66388363. The next prime is 66388381. The reversal of 66388378 is 87388366.

It is a happy number.

66388378 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an unprimeable number.

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, 2371000 + ... + 2371027.

It is an arithmetic number, because the mean of its divisors is an integer number (14226084).

Almost surely, 2^66388378 is an apocalyptic number.

66388378 is a deficient number, since it is larger than the sum of its proper divisors (47420294).

66388378 is a wasteful number, since it uses less digits than its factorization.

66388378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4742036.

The product of its digits is 1161216, while the sum is 49.

The square root of 66388378 is about 8147.9063568502. The cubic root of 66388378 is about 404.9151435286.

It can be divided in two parts, 66388 and 378, that added together give a palindrome (66766).

The spelling of 66388378 in words is "sixty-six million, three hundred eighty-eight thousand, three hundred seventy-eight".