64703767808 has 72 divisors (see below), whose sum is σ = 135411533376. Its totient is φ = 30798028800.

The previous prime is 64703767781. The next prime is 64703767879. The reversal of 64703767808 is 80876730746.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1216328 + ... + 1268408.

Almost surely, 2^64703767808 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 64703767808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67705766688).

64703767808 is an abundant number, since it is smaller than the sum of its proper divisors (70707765568).

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

64703767808 is a wasteful number, since it uses less digits than its factorization.

64703767808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52331 (or 52317 counting only the distinct ones).

The product of its (nonzero) digits is 9483264, while the sum is 56.

The spelling of 64703767808 in words is "sixty-four billion, seven hundred three million, seven hundred sixty-seven thousand, eight hundred eight".