64520 has 16 divisors (see below), whose sum is σ = 145260. Its totient is φ = 25792.

The previous prime is 64513. The next prime is 64553. The reversal of 64520 is 2546.

64520 = T₆₁ + T₆₂ + ... + T₈₄.

It can be written as a sum of positive squares in 2 ways, for example, as 64516 + 4 = 254^2 + 2^2 .

It is an unprimeable number.

64520 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 767 + ... + 846.

2⁶⁴⁵²⁰ is an apocalyptic number.

It is an amenable number.

64520 is an abundant number, since it is smaller than the sum of its proper divisors (80740).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72630).

64520 is a wasteful number, since it uses less digits than its factorization.

64520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624 (or 1620 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 64520 is about 254.0078738937. The cubic root of 64520 is about 40.1080412478.

The spelling of 64520 in words is "sixty-four thousand, five hundred twenty".