64404604640 has 96 divisors (see below), whose sum is σ = 154224000000. Its totient is φ = 25412295168.

The previous prime is 64404604637. The next prime is 64404604679. The reversal of 64404604640 is 4640640446.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 64404604594 and 64404604603.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21473861 + ... + 21476859.

It is an arithmetic number, because the mean of its divisors is an integer number (1606500000).

Almost surely, 2^64404604640 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 64404604640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77112000000).

64404604640 is an abundant number, since it is smaller than the sum of its proper divisors (89819395360).

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

64404604640 is a wasteful number, since it uses less digits than its factorization.

64404604640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4792 (or 4784 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 38.

The spelling of 64404604640 in words is "sixty-four billion, four hundred four million, six hundred four thousand, six hundred forty".