6431128668 has 36 divisors (see below), whose sum is σ = 16462249440. Its totient is φ = 2116573056.

The previous prime is 6431128663. The next prime is 6431128673. The reversal of 6431128668 is 8668211346.

It is an interprime number because it is at equal distance from previous prime (6431128663) and next prime (6431128673).

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6431128663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1127805 + ... + 1133492.

Almost surely, 2^6431128668 is an apocalyptic number.

It is an amenable number.

6431128668 is an abundant number, since it is smaller than the sum of its proper divisors (10031120772).

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

6431128668 is a wasteful number, since it uses less digits than its factorization.

6431128668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2261386 (or 2261381 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 6431128668 is about 80194.3181777861. The cubic root of 6431128668 is about 1859.6408012577.

The spelling of 6431128668 in words is "six billion, four hundred thirty-one million, one hundred twenty-eight thousand, six hundred sixty-eight".