6388967664 has 280 divisors, whose sum is σ = 19776829440. Its totient is φ = 1992864384.

The previous prime is 6388967653. The next prime is 6388967687. The reversal of 6388967664 is 4667698836.

Its product of digits (62705664) is a multiple of the sum of its prime divisors (378).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 28145119 + ... + 28145345.

Almost surely, 2^6388967664 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 6388967664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9888414720).

6388967664 is an abundant number, since it is smaller than the sum of its proper divisors (13387861776).

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

6388967664 is a wasteful number, since it uses less digits than its factorization.

6388967664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399 (or 378 counting only the distinct ones).

The product of its digits is 62705664, while the sum is 63.

The square root of 6388967664 is about 79931.0181594104. The cubic root of 6388967664 is about 1855.5680955345.

The spelling of 6388967664 in words is "six billion, three hundred eighty-eight million, nine hundred sixty-seven thousand, six hundred sixty-four".