6440601684 has 48 divisors (see below), whose sum is σ = 17257121280. Its totient is φ = 1848975840.

The previous prime is 6440601683. The next prime is 6440601697. The reversal of 6440601684 is 4861060446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440601683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1281504 + ... + 1286519.

It is an arithmetic number, because the mean of its divisors is an integer number (359523360).

Almost surely, 2^6440601684 is an apocalyptic number.

It is an amenable number.

6440601684 is an abundant number, since it is smaller than the sum of its proper divisors (10816519596).

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

6440601684 is a wasteful number, since it uses less digits than its factorization.

6440601684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2568060 (or 2568058 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 39.

The square root of 6440601684 is about 80253.3593315570. The cubic root of 6440601684 is about 1860.5534334162.

The spelling of 6440601684 in words is "six billion, four hundred forty million, six hundred one thousand, six hundred eighty-four".