65005520 has 40 divisors (see below), whose sum is σ = 152714184. Its totient is φ = 25731072.

The previous prime is 65005489. The next prime is 65005547. The reversal of 65005520 is 2550056.

It can be written as a sum of positive squares in 4 ways, for example, as 620944 + 64384576 = 788^2 + 8024^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3572 + ... + 11948.

Almost surely, 2^65005520 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 65005520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76357092).

65005520 is an abundant number, since it is smaller than the sum of its proper divisors (87708664).

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

65005520 is a wasteful number, since it uses less digits than its factorization.

65005520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8487 (or 8481 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 65005520 is about 8062.6000768983. The cubic root of 65005520 is about 402.0839572835.

Adding to 65005520 its reverse (2550056), we get a palindrome (67555576).

The spelling of 65005520 in words is "sixty-five million, five thousand, five hundred twenty".