43778448289 has 3 divisors (see below), whose sum is σ = 43778657523. Its totient is φ = 43778239056.

The previous prime is 43778448277. The next prime is 43778448293. The reversal of 43778448289 is 98284487734.

The square root of 43778448289 is 209233.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 19194717025 + 24583731264 = 138545^2 + 156792^2 .

It is not a de Polignac number, because 43778448289 - 2⁹ = 43778447777 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43778448289.

It is not an unprimeable number, because it can be changed into a prime (43778448089) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 104617 + ... + 313849.

It is an arithmetic number, because the mean of its divisors is an integer number (14592885841).

Almost surely, 2^43778448289 is an apocalyptic number.

43778448289 is the 209233-rd square number.

43778448289 is the 104617-th centered octagonal number.

It is an amenable number.

43778448289 is a deficient number, since it is larger than the sum of its proper divisors (209234).

43778448289 is an frugal number, since it uses more digits than its factorization.

43778448289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418466 (or 209233 counting only the distinct ones).

The product of its digits is 86704128, while the sum is 64.

Multiplying 43778448289 by its sum of digits (64), we get a square (2801820690496 = 1673864²).

The spelling of 43778448289 in words is "forty-three billion, seven hundred seventy-eight million, four hundred forty-eight thousand, two hundred eighty-nine".