64317755840 has 224 divisors, whose sum is σ = 169200795456. Its totient is φ = 23141744640.

The previous prime is 64317755819. The next prime is 64317755863. The reversal of 64317755840 is 4855771346.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28673759 + ... + 28676001.

It is an arithmetic number, because the mean of its divisors is an integer number (755360694).

Almost surely, 2^64317755840 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 64317755840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84600397728).

64317755840 is an abundant number, since it is smaller than the sum of its proper divisors (104883039616).

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

64317755840 is a wasteful number, since it uses less digits than its factorization.

64317755840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2447 (or 2437 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 50.

The spelling of 64317755840 in words is "sixty-four billion, three hundred seventeen million, seven hundred fifty-five thousand, eight hundred forty".