64873768320 has 256 divisors, whose sum is σ = 232602840000. Its totient is φ = 17299298304.

The previous prime is 64873768307. The next prime is 64873768369. The reversal of 64873768320 is 2386737846.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1376506 + ... + 1422854.

Almost surely, 2^64873768320 is an apocalyptic number.

64873768320 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 64873768320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116301420000).

64873768320 is an abundant number, since it is smaller than the sum of its proper divisors (167729071680).

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

64873768320 is an frugal number, since it uses more digits than its factorization.

64873768320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46389 (or 46359 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 54.

The spelling of 64873768320 in words is "sixty-four billion, eight hundred seventy-three million, seven hundred sixty-eight thousand, three hundred twenty".