65601720 has 96 divisors (see below), whose sum is σ = 214812000. Its totient is φ = 17362176.

The previous prime is 65601713. The next prime is 65601721. The reversal of 65601720 is 2710656.

65601720 is a `hidden beast` number, since 656 + 0 + 1 + 7 + 2 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65601721) 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 23 ways as a sum of consecutive naturals, for example, 53029 + ... + 54251.

It is an arithmetic number, because the mean of its divisors is an integer number (2237625).

Almost surely, 2^65601720 is an apocalyptic number.

65601720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65601720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107406000).

65601720 is an abundant number, since it is smaller than the sum of its proper divisors (149210280).

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

65601720 is a wasteful number, since it uses less digits than its factorization.

65601720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1389 (or 1382 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 65601720 is about 8099.4888727623. The cubic root of 65601720 is about 403.3094598411.

The spelling of 65601720 in words is "sixty-five million, six hundred one thousand, seven hundred twenty".