64739793720 has 768 divisors, whose sum is σ = 258492902400. Its totient is φ = 12849070080.

The previous prime is 64739793709. The next prime is 64739793763. The reversal of 64739793720 is 2739793746.

It is a happy number.

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 191 ways as a sum of consecutive naturals, for example, 66672835 + ... + 66673805.

It is an arithmetic number, because the mean of its divisors is an integer number (336579300).

Almost surely, 2^64739793720 is an apocalyptic number.

64739793720 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 64739793720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129246451200).

64739793720 is an abundant number, since it is smaller than the sum of its proper divisors (193753108680).

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

64739793720 is a wasteful number, since it uses less digits than its factorization.

64739793720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1068 (or 1057 counting only the distinct ones).

The product of its (nonzero) digits is 12002256, while the sum is 57.

The spelling of 64739793720 in words is "sixty-four billion, seven hundred thirty-nine million, seven hundred ninety-three thousand, seven hundred twenty".