6389711920 has 20 divisors (see below), whose sum is σ = 14856080400. Its totient is φ = 2555884736.

The previous prime is 6389711917. The next prime is 6389711941. The reversal of 6389711920 is 291179836.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39935620 + ... + 39935779.

It is an arithmetic number, because the mean of its divisors is an integer number (742804020).

Almost surely, 2^6389711920 is an apocalyptic number.

It is an amenable number.

6389711920 is an abundant number, since it is smaller than the sum of its proper divisors (8466368480).

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

6389711920 is a wasteful number, since it uses less digits than its factorization.

6389711920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79871412 (or 79871406 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 6389711920 is about 79935.6736382449. The cubic root of 6389711920 is about 1855.6401449453.

The spelling of 6389711920 in words is "six billion, three hundred eighty-nine million, seven hundred eleven thousand, nine hundred twenty".