64864794720 has 384 divisors, whose sum is σ = 242401807872. Its totient is φ = 14399078400.

The previous prime is 64864794713. The next prime is 64864794803. The reversal of 64864794720 is 2749746846.

It is a happy number.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

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 63 ways as a sum of consecutive naturals, for example, 3311355 + ... + 3330885.

It is an arithmetic number, because the mean of its divisors is an integer number (631254708).

Almost surely, 2^64864794720 is an apocalyptic number.

64864794720 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 64864794720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121200903936).

64864794720 is an abundant number, since it is smaller than the sum of its proper divisors (177537013152).

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

64864794720 is a wasteful number, since it uses less digits than its factorization.

64864794720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19614 (or 19606 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 57.

The spelling of 64864794720 in words is "sixty-four billion, eight hundred sixty-four million, seven hundred ninety-four thousand, seven hundred twenty".