66393378 has 32 divisors (see below), whose sum is σ = 149627520. Its totient is φ = 21818160.

The previous prime is 66393373. The next prime is 66393389. The reversal of 66393378 is 87339366.

It is a happy number.

66393378 is a `hidden beast` number, since 6 + 639 + 3 + 3 + 7 + 8 = 666.

66393378 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (66393373) 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 15 ways as a sum of consecutive naturals, for example, 4825 + ... + 12492.

It is an arithmetic number, because the mean of its divisors is an integer number (4675860).

Almost surely, 2^66393378 is an apocalyptic number.

66393378 is an abundant number, since it is smaller than the sum of its proper divisors (83234142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66393378 is a wasteful number, since it uses less digits than its factorization.

66393378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17399 (or 17393 counting only the distinct ones).

The product of its digits is 489888, while the sum is 45.

The square root of 66393378 is about 8148.2131783600. The cubic root of 66393378 is about 404.9253085854.

The spelling of 66393378 in words is "sixty-six million, three hundred ninety-three thousand, three hundred seventy-eight".