66432210 has 48 divisors (see below), whose sum is σ = 172658304. Its totient is φ = 16351296.

The previous prime is 66432169. The next prime is 66432217. The reversal of 66432210 is 1223466.

It is a Curzon number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (66432217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1482 + ... + 11621.

It is an arithmetic number, because the mean of its divisors is an integer number (3597048).

Almost surely, 2^66432210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66432210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86329152).

66432210 is an abundant number, since it is smaller than the sum of its proper divisors (106226094).

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

66432210 is a wasteful number, since it uses less digits than its factorization.

66432210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13139 (or 13126 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 66432210 is about 8150.5956837522. The cubic root of 66432210 is about 405.0042371146.

Adding to 66432210 its reverse (1223466), we get a palindrome (67655676).

The spelling of 66432210 in words is "sixty-six million, four hundred thirty-two thousand, two hundred ten".