66379938 has 32 divisors (see below), whose sum is σ = 135146880. Its totient is φ = 21732480.

The previous prime is 66379921. The next prime is 66379969. The reversal of 66379938 is 83997366.

It is a happy number.

66379938 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 15 ways as a sum of consecutive naturals, for example, 104883 + ... + 105513.

It is an arithmetic number, because the mean of its divisors is an integer number (4223340).

Almost surely, 2^66379938 is an apocalyptic number.

66379938 is an abundant number, since it is smaller than the sum of its proper divisors (68766942).

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

66379938 is a wasteful number, since it uses less digits than its factorization.

66379938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922.

The product of its digits is 1469664, while the sum is 51.

The square root of 66379938 is about 8147.3884159281. The cubic root of 66379938 is about 404.8979837549.

It can be divided in two parts, 663 and 79938, that added together give a triangular number (80601 = T₄₀₁).

The spelling of 66379938 in words is "sixty-six million, three hundred seventy-nine thousand, nine hundred thirty-eight".