6491720 has 16 divisors (see below), whose sum is σ = 14606460. Its totient is φ = 2596672.

The previous prime is 6491707. The next prime is 6491729. The reversal of 6491720 is 271946.

It can be written as a sum of positive squares in 2 ways, for example, as 6482116 + 9604 = 2546^2 + 98^2 .

It is not an unprimeable number, because it can be changed into a prime (6491729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81107 + ... + 81186.

Almost surely, 2^6491720 is an apocalyptic number.

It is an amenable number.

6491720 is an abundant number, since it is smaller than the sum of its proper divisors (8114740).

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

6491720 is a wasteful number, since it uses less digits than its factorization.

6491720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162304 (or 162300 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 6491720 is about 2547.8853977367. The cubic root of 6491720 is about 186.5462800858.

The spelling of 6491720 in words is "six million, four hundred ninety-one thousand, seven hundred twenty".