6687849 has 16 divisors (see below), whose sum is σ = 10257408. Its totient is φ = 3796752.

The previous prime is 6687823. The next prime is 6687853. The reversal of 6687849 is 9487866.

It is not a de Polignac number, because 6687849 - 2¹⁷ = 6556777 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6687798 and 6687807.

It is not an unprimeable number, because it can be changed into a prime (6687809) 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, 2554 + ... + 4460.

It is an arithmetic number, because the mean of its divisors is an integer number (641088).

Almost surely, 2^6687849 is an apocalyptic number.

It is an amenable number.

6687849 is a deficient number, since it is larger than the sum of its proper divisors (3569559).

6687849 is a wasteful number, since it uses less digits than its factorization.

6687849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2084.

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

The square root of 6687849 is about 2586.0875855237. The cubic root of 6687849 is about 188.4063284192.

The spelling of 6687849 in words is "six million, six hundred eighty-seven thousand, eight hundred forty-nine".