66934218 has 32 divisors (see below), whose sum is σ = 144639936. Its totient is φ = 20527488.

The previous prime is 66934213. The next prime is 66934237. The reversal of 66934218 is 81243966.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (66934213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25830 + ... + 28302.

It is an arithmetic number, because the mean of its divisors is an integer number (4519998).

Almost surely, 2^66934218 is an apocalyptic number.

66934218 is an abundant number, since it is smaller than the sum of its proper divisors (77705718).

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

66934218 is a wasteful number, since it uses less digits than its factorization.

66934218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2838.

The product of its digits is 62208, while the sum is 39.

The square root of 66934218 is about 8181.3335098870. Note that the first 3 decimals coincide. The cubic root of 66934218 is about 406.0218427586.

The spelling of 66934218 in words is "sixty-six million, nine hundred thirty-four thousand, two hundred eighteen".