4431968781 has 8 divisors (see below), whose sum is σ = 5911857984. Its totient is φ = 2953362720.

The previous prime is 4431968767. The next prime is 4431968789. The reversal of 4431968781 is 1878691344.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4431968781 - 2¹⁴ = 4431952397 is a prime.

It is a super-2 number, since 2×4431968781² = 39284694551517251922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4431968789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 312696 + ... + 326561.

It is an arithmetic number, because the mean of its divisors is an integer number (738982248).

Almost surely, 2^4431968781 is an apocalyptic number.

It is an amenable number.

4431968781 is a deficient number, since it is larger than the sum of its proper divisors (1479889203).

4431968781 is a wasteful number, since it uses less digits than its factorization.

4431968781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641571.

The product of its digits is 1161216, while the sum is 51.

The square root of 4431968781 is about 66573.0334369706. The cubic root of 4431968781 is about 1642.6015596221.

The spelling of 4431968781 in words is "four billion, four hundred thirty-one million, nine hundred sixty-eight thousand, seven hundred eighty-one".