64520020 has 12 divisors (see below), whose sum is σ = 135492084. Its totient is φ = 25808000.

The previous prime is 64520017. The next prime is 64520033. The reversal of 64520020 is 2002546.

It can be written as a sum of positive squares in 2 ways, for example, as 38489616 + 26030404 = 6204^2 + 5102^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 64520020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1612981 + ... + 1613020.

It is an arithmetic number, because the mean of its divisors is an integer number (11291007).

Almost surely, 2^64520020 is an apocalyptic number.

It is an amenable number.

64520020 is an abundant number, since it is smaller than the sum of its proper divisors (70972064).

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

64520020 is a wasteful number, since it uses less digits than its factorization.

64520020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3226010 (or 3226008 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 64520020 is about 8032.4354961618. The cubic root of 64520020 is about 401.0804539206.

Adding to 64520020 its reverse (2002546), we get a palindrome (66522566).

The spelling of 64520020 in words is "sixty-four million, five hundred twenty thousand, twenty".