6685987 has 16 divisors (see below), whose sum is σ = 8607744. Its totient is φ = 5040000.

The previous prime is 6685969. The next prime is 6686041. The reversal of 6685987 is 7895866.

It is not a de Polignac number, because 6685987 - 2⁷ = 6685859 is a prime.

It is a Duffinian number.

6685987 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6685987.

It is not an unprimeable number, because it can be changed into a prime (6685907) 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, 987 + ... + 3787.

It is an arithmetic number, because the mean of its divisors is an integer number (537984).

Almost surely, 2^6685987 is an apocalyptic number.

6685987 is a deficient number, since it is larger than the sum of its proper divisors (1921757).

6685987 is a wasteful number, since it uses less digits than its factorization.

6685987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2850.

The product of its digits is 725760, while the sum is 49.

The square root of 6685987 is about 2585.7275571877. The cubic root of 6685987 is about 188.3888417233.

The spelling of 6685987 in words is "six million, six hundred eighty-five thousand, nine hundred eighty-seven".