6440746242 has 128 divisors (see below), whose sum is σ = 16432243200. Its totient is φ = 1640411136.

The previous prime is 6440746229. The next prime is 6440746243. The reversal of 6440746242 is 2426470446.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 6440746242.

It is not an unprimeable number, because it can be changed into a prime (6440746243) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1094484 + ... + 1100352.

It is an arithmetic number, because the mean of its divisors is an integer number (128376900).

Almost surely, 2^6440746242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6440746242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8216121600).

6440746242 is an abundant number, since it is smaller than the sum of its proper divisors (9991496958).

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

6440746242 is a wasteful number, since it uses less digits than its factorization.

6440746242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5980.

The product of its (nonzero) digits is 258048, while the sum is 39.

The square root of 6440746242 is about 80254.2599616992. The cubic root of 6440746242 is about 1860.5673532271.

The spelling of 6440746242 in words is "six billion, four hundred forty million, seven hundred forty-six thousand, two hundred forty-two".