65144140 has 48 divisors (see below), whose sum is σ = 141039360. Its totient is φ = 25260480.

The previous prime is 65144129. The next prime is 65144143. The reversal of 65144140 is 4144156.

It is not an unprimeable number, because it can be changed into a prime (65144143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 181281 + ... + 181639.

It is an arithmetic number, because the mean of its divisors is an integer number (2938320).

Almost surely, 2^65144140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65144140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70519680).

65144140 is an abundant number, since it is smaller than the sum of its proper divisors (75895220).

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

65144140 is a wasteful number, since it uses less digits than its factorization.

65144140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622 (or 620 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 65144140 is about 8071.1919813619. The cubic root of 65144140 is about 402.3695602426.

Adding to 65144140 its reverse (4144156), we get a palindrome (69288296).

The spelling of 65144140 in words is "sixty-five million, one hundred forty-four thousand, one hundred forty".