6487720 has 32 divisors (see below), whose sum is σ = 14679720. Its totient is φ = 2580480.

The previous prime is 6487687. The next prime is 6487751. The reversal of 6487720 is 277846.

6487720 = T₂₆₇ + T₂₆₈ + ... + T₃₈₆.

It can be written as a sum of positive squares in 4 ways, for example, as 5410276 + 1077444 = 2326^2 + 1038^2 .

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9304 + ... + 9976.

Almost surely, 2^6487720 is an apocalyptic number.

It is an amenable number.

6487720 is an abundant number, since it is smaller than the sum of its proper divisors (8192000).

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

6487720 is a wasteful number, since it uses less digits than its factorization.

6487720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925 (or 921 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 6487720 is about 2547.1003121196. The cubic root of 6487720 is about 186.5079575029.

The spelling of 6487720 in words is "six million, four hundred eighty-seven thousand, seven hundred twenty".