66043830 has 64 divisors (see below), whose sum is σ = 163995840. Its totient is φ = 17012736.

The previous prime is 66043811. The next prime is 66043837. The reversal of 66043830 is 3834066.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66043837) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 115786 + ... + 116354.

It is an arithmetic number, because the mean of its divisors is an integer number (2562435).

Almost surely, 2^66043830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66043830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81997920).

66043830 is an abundant number, since it is smaller than the sum of its proper divisors (97952010).

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

66043830 is a wasteful number, since it uses less digits than its factorization.

66043830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 66043830 is about 8126.7355069548. The cubic root of 66043830 is about 404.2134406253.

Adding to 66043830 its reverse (3834066), we get a palindrome (69877896).

The spelling of 66043830 in words is "sixty-six million, forty-three thousand, eight hundred thirty".