66393908 has 24 divisors (see below), whose sum is σ = 140599872. Its totient is φ = 26780544.

The previous prime is 66393907. The next prime is 66393913. The reversal of 66393908 is 80939366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66393907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69266 + ... + 70217.

It is an arithmetic number, because the mean of its divisors is an integer number (5858328).

Almost surely, 2^66393908 is an apocalyptic number.

66393908 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

66393908 is an abundant number, since it is smaller than the sum of its proper divisors (74205964).

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

66393908 is a wasteful number, since it uses less digits than its factorization.

66393908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139511 (or 139509 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 66393908 is about 8148.2457007628. The cubic root of 66393908 is about 404.9263860515.

The spelling of 66393908 in words is "sixty-six million, three hundred ninety-three thousand, nine hundred eight".