6443672709 has 32 divisors (see below), whose sum is σ = 9207878400. Its totient is φ = 3998269440.

The previous prime is 6443672567. The next prime is 6443672723. The reversal of 6443672709 is 9072763446.

It is not a de Polignac number, because 6443672709 - 2¹² = 6443668613 is a prime.

It is a super-2 number, since 2×6443672709² = 83041835961422797362, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6443672759) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1154277 + ... + 1159845.

It is an arithmetic number, because the mean of its divisors is an integer number (287746200).

Almost surely, 2^6443672709 is an apocalyptic number.

6443672709 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

6443672709 is a deficient number, since it is larger than the sum of its proper divisors (2764205691).

6443672709 is a wasteful number, since it uses less digits than its factorization.

6443672709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6045.

The product of its (nonzero) digits is 1524096, while the sum is 48.

The square root of 6443672709 is about 80272.4903625146. The cubic root of 6443672709 is about 1860.8491044561.

The spelling of 6443672709 in words is "six billion, four hundred forty-three million, six hundred seventy-two thousand, seven hundred nine".