43728609 has 4 divisors (see below), whose sum is σ = 58304816. Its totient is φ = 29152404.

The previous prime is 43728583. The next prime is 43728611. The reversal of 43728609 is 90682734.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 43728609 - 2⁵ = 43728577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (43720609) 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, 7288099 + ... + 7288104.

It is an arithmetic number, because the mean of its divisors is an integer number (14576204).

Almost surely, 2^43728609 is an apocalyptic number.

It is an amenable number.

43728609 is a deficient number, since it is larger than the sum of its proper divisors (14576207).

43728609 is a wasteful number, since it uses less digits than its factorization.

43728609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14576206.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 43728609 is about 6612.7610723509. The cubic root of 43728609 is about 352.3074991393.

The spelling of 43728609 in words is "forty-three million, seven hundred twenty-eight thousand, six hundred nine".