6691240 has 24 divisors (see below), whose sum is σ = 15092190. Its totient is φ = 2669952.

The previous prime is 6691231. The next prime is 6691259. The reversal of 6691240 is 421966.

It can be written as a sum of positive squares in 3 ways, for example, as 6687396 + 3844 = 2586^2 + 62^2 .

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6691199 and 6691208.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16156 + ... + 16564.

Almost surely, 2^6691240 is an apocalyptic number.

It is an amenable number.

6691240 is an abundant number, since it is smaller than the sum of its proper divisors (8400950).

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

6691240 is an equidigital number, since it uses as much as digits as its factorization.

6691240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829 (or 416 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 6691240 is about 2586.7431260177. The cubic root of 6691240 is about 188.4381661551.

The spelling of 6691240 in words is "six million, six hundred ninety-one thousand, two hundred forty".