4438468781 has 4 divisors (see below), whose sum is σ = 4454492412. Its totient is φ = 4422445152.

The previous prime is 4438468777. The next prime is 4438468789. The reversal of 4438468781 is 1878648344.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1286656900 + 3151811881 = 35870^2 + 56141^2 .

It is a cyclic number.

It is not a de Polignac number, because 4438468781 - 2² = 4438468777 is a prime.

It is a super-2 number, since 2×4438468781² = 39400010239823251922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4438468789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8011400 + ... + 8011953.

It is an arithmetic number, because the mean of its divisors is an integer number (1113623103).

Almost surely, 2^4438468781 is an apocalyptic number.

It is an amenable number.

4438468781 is a deficient number, since it is larger than the sum of its proper divisors (16023631).

4438468781 is a wasteful number, since it uses less digits than its factorization.

4438468781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16023630.

The product of its digits is 4128768, while the sum is 53.

The square root of 4438468781 is about 66621.8341161514. The cubic root of 4438468781 is about 1643.4041897299.

The spelling of 4438468781 in words is "four billion, four hundred thirty-eight million, four hundred sixty-eight thousand, seven hundred eighty-one".