64520000 has 70 divisors (see below), whose sum is σ = 160087818. Its totient is φ = 25792000.

The previous prime is 64519999. The next prime is 64520003. The reversal of 64520000 is 2546.

It can be written as a sum of positive squares in 5 ways, for example, as 21381376 + 43138624 = 4624^2 + 6568^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64520003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 39194 + ... + 40806.

Almost surely, 2^64520000 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 64520000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80043909).

64520000 is an abundant number, since it is smaller than the sum of its proper divisors (95567818).

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

64520000 is an equidigital number, since it uses as much as digits as its factorization.

64520000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1645 (or 1620 counting only the distinct ones).

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

The square root of 64520000 is about 8032.4342512093. The cubic root of 64520000 is about 401.0804124781.

Adding to 64520000 its reverse (2546), we get a palindrome (64522546).

The spelling of 64520000 in words is "sixty-four million, five hundred twenty thousand".