6391320 has 128 divisors (see below), whose sum is σ = 21954240. Its totient is φ = 1474560.

The previous prime is 6391289. The next prime is 6391321. The reversal of 6391320 is 231936.

It is a Harshad number since it is a multiple of its sum of digits (24).

6391320 is an undulating number in base 8.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6391321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26400 + ... + 26640.

Almost surely, 2^6391320 is an apocalyptic number.

6391320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6391320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10977120).

6391320 is an abundant number, since it is smaller than the sum of its proper divisors (15562920).

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

6391320 is a wasteful number, since it uses less digits than its factorization.

6391320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285 (or 281 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 24.

The square root of 6391320 is about 2528.1060104355. The cubic root of 6391320 is about 185.5795799720.

The spelling of 6391320 in words is "six million, three hundred ninety-one thousand, three hundred twenty".