6689540 has 48 divisors (see below), whose sum is σ = 16511040. Its totient is φ = 2244480.

The previous prime is 6689537. The next prime is 6689561. The reversal of 6689540 is 459866.

It is a junction number, because it is equal to n+sod(n) for n = 6689494 and 6689503.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1691 + ... + 4029.

It is an arithmetic number, because the mean of its divisors is an integer number (343980).

Almost surely, 2^6689540 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 6689540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8255520).

6689540 is an abundant number, since it is smaller than the sum of its proper divisors (9821500).

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

6689540 is a wasteful number, since it uses less digits than its factorization.

6689540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2372 (or 2370 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 6689540 is about 2586.4145066095. The cubic root of 6689540 is about 188.4222063820.

The spelling of 6689540 in words is "six million, six hundred eighty-nine thousand, five hundred forty".