65140720 has 80 divisors (see below), whose sum is σ = 158605920. Its totient is φ = 24855552.

The previous prime is 65140711. The next prime is 65140723. The reversal of 65140720 is 2704156.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65140723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174454 + ... + 174826.

It is an arithmetic number, because the mean of its divisors is an integer number (1982574).

Almost surely, 2^65140720 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 65140720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79302960).

65140720 is an abundant number, since it is smaller than the sum of its proper divisors (93465200).

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

65140720 is a wasteful number, since it uses less digits than its factorization.

65140720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482 (or 476 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 65140720 is about 8070.9801139639. The cubic root of 65140720 is about 402.3625187908.

Adding to 65140720 its reverse (2704156), we get a palindrome (67844876).

The spelling of 65140720 in words is "sixty-five million, one hundred forty thousand, seven hundred twenty".