65520720 has 240 divisors, whose sum is σ = 239730192. Its totient is φ = 15974400.

The previous prime is 65520713. The next prime is 65520727. The reversal of 65520720 is 2702556.

65520720 is a `hidden beast` number, since 655 + 2 + 0 + 7 + 2 + 0 = 666.

65520720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (65520713) and next prime (65520727).

It can be written as a sum of positive squares in 8 ways, for example, as 14197824 + 51322896 = 3768^2 + 7164^2 .

It is a tau number, because it is divible by the number of its divisors (240).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65520727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 648670 + ... + 648770.

Almost surely, 2^65520720 is an apocalyptic number.

65520720 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 65520720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119865096).

65520720 is an abundant number, since it is smaller than the sum of its proper divisors (174209472).

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

65520720 is a wasteful number, since it uses less digits than its factorization.

65520720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 65520720 is about 8094.4870127760. The cubic root of 65520720 is about 403.1433995568.

The spelling of 65520720 in words is "sixty-five million, five hundred twenty thousand, seven hundred twenty".