64520040500 has 48 divisors (see below), whose sum is σ = 149200715664. Its totient is φ = 24289894400.

The previous prime is 64520040479. The next prime is 64520040569. The reversal of 64520040500 is 504002546.

It can be written as a sum of positive squares in 8 ways, for example, as 30742011556 + 33778028944 = 175334^2 + 183788^2 .

It is a super-2 number, since 2×64520040500² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64520040500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3786797 + ... + 3803796.

It is an arithmetic number, because the mean of its divisors is an integer number (3108348243).

Almost surely, 2^64520040500 is an apocalyptic number.

It is an amenable number.

64520040500 is an abundant number, since it is smaller than the sum of its proper divisors (84680675164).

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

64520040500 is a wasteful number, since it uses less digits than its factorization.

64520040500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7590629 (or 7590617 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The spelling of 64520040500 in words is "sixty-four billion, five hundred twenty million, forty thousand, five hundred".