43628665 has 4 divisors (see below), whose sum is σ = 52354404. Its totient is φ = 34902928.

The previous prime is 43628659. The next prime is 43628707. The reversal of 43628665 is 56682634.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56682634 = 2 ⋅28341317.

It can be written as a sum of positive squares in 2 ways, for example, as 29767936 + 13860729 = 5456^2 + 3723^2 .

It is a cyclic number.

It is not a de Polignac number, because 43628665 - 2⁷ = 43628537 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4362862 + ... + 4362871.

It is an arithmetic number, because the mean of its divisors is an integer number (13088601).

Almost surely, 2^43628665 is an apocalyptic number.

It is an amenable number.

43628665 is a deficient number, since it is larger than the sum of its proper divisors (8725739).

43628665 is an equidigital number, since it uses as much as digits as its factorization.

43628665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8725738.

The product of its digits is 207360, while the sum is 40.

The square root of 43628665 is about 6605.1998455762. The cubic root of 43628665 is about 352.0388887174.

The spelling of 43628665 in words is "forty-three million, six hundred twenty-eight thousand, six hundred sixty-five".