66813834 has 32 divisors (see below), whose sum is σ = 136865664. Its totient is φ = 21738240.

The previous prime is 66813833. The next prime is 66813847. The reversal of 66813834 is 43831866.

It is a junction number, because it is equal to n+sod(n) for n = 66813792 and 66813801.

It is not an unprimeable number, because it can be changed into a prime (66813833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44374 + ... + 45854.

It is an arithmetic number, because the mean of its divisors is an integer number (4277052).

Almost surely, 2^66813834 is an apocalyptic number.

66813834 is an abundant number, since it is smaller than the sum of its proper divisors (70051830).

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

66813834 is a wasteful number, since it uses less digits than its factorization.

66813834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1662.

The product of its digits is 82944, while the sum is 39.

The square root of 66813834 is about 8173.9729630089. The cubic root of 66813834 is about 405.7782809071.

The spelling of 66813834 in words is "sixty-six million, eight hundred thirteen thousand, eight hundred thirty-four".