66836840 has 32 divisors (see below), whose sum is σ = 171866880. Its totient is φ = 22915392.

The previous prime is 66836839. The next prime is 66836849. The reversal of 66836840 is 4863866.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (66836849) 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 7 ways as a sum of consecutive naturals, for example, 119072 + ... + 119631.

It is an arithmetic number, because the mean of its divisors is an integer number (5370840).

Almost surely, 2^66836840 is an apocalyptic number.

It is an amenable number.

66836840 is an abundant number, since it is smaller than the sum of its proper divisors (105030040).

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

66836840 is a wasteful number, since it uses less digits than its factorization.

66836840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238721 (or 238717 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 41.

The square root of 66836840 is about 8175.3801134871. The cubic root of 66836840 is about 405.8248494259.

It can be divided in two parts, 66836 and 840, that added together give a palindrome (67676).

The spelling of 66836840 in words is "sixty-six million, eight hundred thirty-six thousand, eight hundred forty".