6431918340 has 24 divisors (see below), whose sum is σ = 18009371520. Its totient is φ = 1715178208.

The previous prime is 6431918299. The next prime is 6431918341. The reversal of 6431918340 is 438191346.

It is not an unprimeable number, because it can be changed into a prime (6431918341) 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, 53599260 + ... + 53599379.

It is an arithmetic number, because the mean of its divisors is an integer number (750390480).

Almost surely, 2^6431918340 is an apocalyptic number.

6431918340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6431918340 is an abundant number, since it is smaller than the sum of its proper divisors (11577453180).

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

6431918340 is a wasteful number, since it uses less digits than its factorization.

6431918340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107198651 (or 107198649 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 6431918340 is about 80199.2415176104. The cubic root of 6431918340 is about 1859.7169126344.

The spelling of 6431918340 in words is "six billion, four hundred thirty-one million, nine hundred eighteen thousand, three hundred forty".