66440130 has 64 divisors (see below), whose sum is σ = 165888000. Its totient is φ = 17012160.

The previous prime is 66440119. The next prime is 66440137. The reversal of 66440130 is 3104466.

66440130 = T₄₂₀ + T₄₂₁ + ... + T₇₇₈.

It is a self number, because there is not a number n which added to its sum of digits gives 66440130.

It is not an unprimeable number, because it can be changed into a prime (66440137) 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, 184891 + ... + 185249.

It is an arithmetic number, because the mean of its divisors is an integer number (2592000).

Almost surely, 2^66440130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66440130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82944000).

66440130 is an abundant number, since it is smaller than the sum of its proper divisors (99447870).

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

66440130 is a wasteful number, since it uses less digits than its factorization.

66440130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599.

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

The square root of 66440130 is about 8151.0815233317. The cubic root of 66440130 is about 405.0203312458.

Adding to 66440130 its reverse (3104466), we get a palindrome (69544596).

The spelling of 66440130 in words is "sixty-six million, four hundred forty thousand, one hundred thirty".