65144320 has 40 divisors (see below), whose sum is σ = 156199824. Its totient is φ = 26056704.

The previous prime is 65144291. The next prime is 65144329. The reversal of 65144320 is 2344156.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65144329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10164 + ... + 15283.

Almost surely, 2^65144320 is an apocalyptic number.

It is an amenable number.

65144320 is an abundant number, since it is smaller than the sum of its proper divisors (91055504).

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

65144320 is an equidigital number, since it uses as much as digits as its factorization.

65144320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25470 (or 25454 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 65144320 is about 8071.2031321235. The cubic root of 65144320 is about 402.3699308385.

Adding to 65144320 its reverse (2344156), we get a palindrome (67488476).

The spelling of 65144320 in words is "sixty-five million, one hundred forty-four thousand, three hundred twenty".