6389320728 has 64 divisors (see below), whose sum is σ = 18748604160. Its totient is φ = 1776180096.

The previous prime is 6389320727. The next prime is 6389320747. The reversal of 6389320728 is 8270239836.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6389320727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 507726 + ... + 520157.

It is an arithmetic number, because the mean of its divisors is an integer number (292946940).

Almost surely, 2^6389320728 is an apocalyptic number.

It is an amenable number.

6389320728 is an abundant number, since it is smaller than the sum of its proper divisors (12359283432).

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

6389320728 is a wasteful number, since it uses less digits than its factorization.

6389320728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027936 (or 1027932 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 48.

The square root of 6389320728 is about 79933.2266832761. The cubic root of 6389320728 is about 1855.6022754032.

The spelling of 6389320728 in words is "six billion, three hundred eighty-nine million, three hundred twenty thousand, seven hundred twenty-eight".