64340640852 has 96 divisors (see below), whose sum is σ = 157387466880. Its totient is φ = 20430359040.

The previous prime is 64340640827. The next prime is 64340640853. The reversal of 64340640852 is 25804604346.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64340640853) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39887998 + ... + 39889610.

It is an arithmetic number, because the mean of its divisors is an integer number (1639452780).

Almost surely, 2^64340640852 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 64340640852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78693733440).

64340640852 is an abundant number, since it is smaller than the sum of its proper divisors (93046826028).

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

64340640852 is a wasteful number, since it uses less digits than its factorization.

64340640852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3113 (or 3111 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 42.

The spelling of 64340640852 in words is "sixty-four billion, three hundred forty million, six hundred forty thousand, eight hundred fifty-two".