6439633972 has 24 divisors (see below), whose sum is σ = 11429914496. Its totient is φ = 3173992128.

The previous prime is 6439633969. The next prime is 6439633979. The reversal of 6439633972 is 2793369346.

It is a super-3 number, since 3×6439633972³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6439633979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 662983 + ... + 672625.

Almost surely, 2^6439633972 is an apocalyptic number.

It is an amenable number.

6439633972 is a deficient number, since it is larger than the sum of its proper divisors (4990280524).

6439633972 is a wasteful number, since it uses less digits than its factorization.

6439633972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12007 (or 12005 counting only the distinct ones).

The product of its digits is 4408992, while the sum is 52.

The square root of 6439633972 is about 80247.3299991969. The cubic root of 6439633972 is about 1860.4602449143.

The spelling of 6439633972 in words is "six billion, four hundred thirty-nine million, six hundred thirty-three thousand, nine hundred seventy-two".