6491688 has 64 divisors (see below), whose sum is σ = 19647360. Its totient is φ = 1744896.

The previous prime is 6491677. The next prime is 6491689. The reversal of 6491688 is 8861946.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6491689) 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, 1720 + ... + 3992.

It is an arithmetic number, because the mean of its divisors is an integer number (306990).

Almost surely, 2^6491688 is an apocalyptic number.

6491688 is a gapful number since it is divisible by the number (68) 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 6491688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9823680).

6491688 is an abundant number, since it is smaller than the sum of its proper divisors (13155672).

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

6491688 is a wasteful number, since it uses less digits than its factorization.

6491688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2306 (or 2302 counting only the distinct ones).

The product of its digits is 82944, while the sum is 42.

The square root of 6491688 is about 2547.8791180117. The cubic root of 6491688 is about 186.5459735676.

The spelling of 6491688 in words is "six million, four hundred ninety-one thousand, six hundred eighty-eight".