64386644800 has 84 divisors (see below), whose sum is σ = 158597399340. Its totient is φ = 25727672320.

The previous prime is 64386644753. The next prime is 64386644831. The reversal of 64386644800 is 844668346.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 4247910976 + 60138733824 = 65176^2 + 245232^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1542606 + ... + 1583794.

Almost surely, 2^64386644800 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 64386644800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79298699670).

64386644800 is an abundant number, since it is smaller than the sum of its proper divisors (94210754540).

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

64386644800 is a wasteful number, since it uses less digits than its factorization.

64386644800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42188 (or 42173 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 49.

The spelling of 64386644800 in words is "sixty-four billion, three hundred eighty-six million, six hundred forty-four thousand, eight hundred".