43365728639 has 4 divisors (see below), whose sum is σ = 43418040360. Its totient is φ = 43313416920.

The previous prime is 43365728561. The next prime is 43365728657. The reversal of 43365728639 is 93682756334.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 43365728639 - 2¹² = 43365724543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43365728699) 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 3 ways as a sum of consecutive naturals, for example, 26154617 + ... + 26156274.

It is an arithmetic number, because the mean of its divisors is an integer number (10854510090).

Almost surely, 2^43365728639 is an apocalyptic number.

43365728639 is a deficient number, since it is larger than the sum of its proper divisors (52311721).

43365728639 is an equidigital number, since it uses as much as digits as its factorization.

43365728639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52311720.

The product of its digits is 19595520, while the sum is 56.

The spelling of 43365728639 in words is "forty-three billion, three hundred sixty-five million, seven hundred twenty-eight thousand, six hundred thirty-nine".