6438872331 has 24 divisors (see below), whose sum is σ = 9869379520. Its totient is φ = 4192747272.

The previous prime is 6438872249. The next prime is 6438872351. The reversal of 6438872331 is 1332788346.

It is not a de Polignac number, because 6438872331 - 2²⁹ = 5902001419 is a prime.

It is a super-2 number, since 2×6438872331² = 82918153789834747122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6438872351) 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 23 ways as a sum of consecutive naturals, for example, 297661 + ... + 318558.

Almost surely, 2^6438872331 is an apocalyptic number.

6438872331 is a deficient number, since it is larger than the sum of its proper divisors (3430507189).

6438872331 is an equidigital number, since it uses as much as digits as its factorization.

6438872331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616277 (or 616265 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 6438872331 is about 80242.5842741870. The cubic root of 6438872331 is about 1860.3868940233.

The spelling of 6438872331 in words is "six billion, four hundred thirty-eight million, eight hundred seventy-two thousand, three hundred thirty-one".