6687984 has 20 divisors (see below), whose sum is σ = 17277416. Its totient is φ = 2229312.

The previous prime is 6687983. The next prime is 6688001. The reversal of 6687984 is 4897866.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 139333 = 6687984 / (6 + 6 + 8 + 7 + 9 + 8 + 4).

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 (6687983) 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, 69619 + ... + 69714.

Almost surely, 2^6687984 is an apocalyptic number.

It is an amenable number.

6687984 is an abundant number, since it is smaller than the sum of its proper divisors (10589432).

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

6687984 is a wasteful number, since it uses less digits than its factorization.

6687984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139344 (or 139338 counting only the distinct ones).

The product of its digits is 580608, while the sum is 48.

The square root of 6687984 is about 2586.1136865962. The cubic root of 6687984 is about 188.4075961254.

The spelling of 6687984 in words is "six million, six hundred eighty-seven thousand, nine hundred eighty-four".