64332135840 has 384 divisors, whose sum is σ = 235525957632. Its totient is φ = 14457139200.

The previous prime is 64332135821. The next prime is 64332135871. The reversal of 64332135840 is 4853123346.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 55315099 + ... + 55316261.

It is an arithmetic number, because the mean of its divisors is an integer number (613348848).

Almost surely, 2^64332135840 is an apocalyptic number.

64332135840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64332135840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117762978816).

64332135840 is an abundant number, since it is smaller than the sum of its proper divisors (171193821792).

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

64332135840 is a wasteful number, since it uses less digits than its factorization.

64332135840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1452 (or 1444 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 39.

The spelling of 64332135840 in words is "sixty-four billion, three hundred thirty-two million, one hundred thirty-five thousand, eight hundred forty".