6391776 has 48 divisors (see below), whose sum is σ = 16934400. Its totient is φ = 2110848.

The previous prime is 6391757. The next prime is 6391789. The reversal of 6391776 is 6771936.

It is a tau number, because it is divible by the number of its divisors (48).

It is a zygodrome in base 2.

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, 13105 + ... + 13583.

It is an arithmetic number, because the mean of its divisors is an integer number (352800).

Almost surely, 2^6391776 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 6391776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8467200).

6391776 is an abundant number, since it is smaller than the sum of its proper divisors (10542624).

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

6391776 is a wasteful number, since it uses less digits than its factorization.

6391776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631 (or 623 counting only the distinct ones).

The product of its digits is 47628, while the sum is 39.

The square root of 6391776 is about 2528.1961949184. The cubic root of 6391776 is about 185.5839933679.

It can be divided in two parts, 639 and 1776, that added together give a triangular number (2415 = T₆₉).

The spelling of 6391776 in words is "six million, three hundred ninety-one thousand, seven hundred seventy-six".