6640242 has 32 divisors (see below), whose sum is σ = 15591552. Its totient is φ = 1845504.

The previous prime is 6640241. The next prime is 6640289. The reversal of 6640242 is 2420466.

It is a super-4 number, since 4×6640242⁴ (a number of 28 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (6640241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 583 + ... + 3690.

It is an arithmetic number, because the mean of its divisors is an integer number (487236).

Almost surely, 2^6640242 is an apocalyptic number.

6640242 is an abundant number, since it is smaller than the sum of its proper divisors (8951310).

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

6640242 is a wasteful number, since it uses less digits than its factorization.

6640242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4322.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 6640242 is about 2576.8667020240. The cubic root of 6640242 is about 187.9582108716.

The spelling of 6640242 in words is "six million, six hundred forty thousand, two hundred forty-two".