65000520 has 384 divisors, whose sum is σ = 259459200. Its totient is φ = 13934592.

The previous prime is 65000473. The next prime is 65000549. The reversal of 65000520 is 2500056.

65000520 = T₈₅ + T₈₆ + ... + T₇₃₀.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 65000493 and 65000502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1511619 + ... + 1511661.

It is an arithmetic number, because the mean of its divisors is an integer number (675675).

Almost surely, 2^65000520 is an apocalyptic number.

65000520 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 65000520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129729600).

65000520 is an abundant number, since it is smaller than the sum of its proper divisors (194458680).

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

65000520 is a wasteful number, since it uses less digits than its factorization.

65000520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109 (or 102 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 65000520 is about 8062.2899972650. The cubic root of 65000520 is about 402.0736480496.

Adding to 65000520 its reverse (2500056), we get a palindrome (67500576).

The spelling of 65000520 in words is "sixty-five million, five hundred twenty", and thus it is an aban number.