6647240 has 32 divisors (see below), whose sum is σ = 15077880. Its totient is φ = 2637312.

The previous prime is 6647239. The next prime is 6647243. The reversal of 6647240 is 427466.

It can be written as a sum of positive squares in 4 ways, for example, as 3818116 + 2829124 = 1954^2 + 1682^2 .

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (6647243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4874 + ... + 6086.

Almost surely, 2^6647240 is an apocalyptic number.

It is an amenable number.

6647240 is an abundant number, since it is smaller than the sum of its proper divisors (8430640).

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

6647240 is a wasteful number, since it uses less digits than its factorization.

6647240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1361 (or 1357 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 6647240 is about 2578.2241950614. The cubic root of 6647240 is about 188.0242159843.

The spelling of 6647240 in words is "six million, six hundred forty-seven thousand, two hundred forty".