6687532720 has 80 divisors (see below), whose sum is σ = 17009054208. Its totient is φ = 2425086720.

The previous prime is 6687532711. The next prime is 6687532741. The reversal of 6687532720 is 272357866.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 312607 + ... + 333313.

Almost surely, 2^6687532720 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 6687532720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8504527104).

6687532720 is an abundant number, since it is smaller than the sum of its proper divisors (10321521488).

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

6687532720 is a wasteful number, since it uses less digits than its factorization.

6687532720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21098 (or 21092 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 46.

The square root of 6687532720 is about 81777.3362246533. The cubic root of 6687532720 is about 1884.0335835149.

The spelling of 6687532720 in words is "six billion, six hundred eighty-seven million, five hundred thirty-two thousand, seven hundred twenty".