44128709 has 2 divisors, whose sum is σ = 44128710. Its totient is φ = 44128708.

The previous prime is 44128703. The next prime is 44128739. The reversal of 44128709 is 90782144.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36566209 + 7562500 = 6047^2 + 2750^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-44128709 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (44128703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22064354 + 22064355.

It is an arithmetic number, because the mean of its divisors is an integer number (22064355).

Almost surely, 2^44128709 is an apocalyptic number.

It is an amenable number.

44128709 is a deficient number, since it is larger than the sum of its proper divisors (1).

44128709 is an equidigital number, since it uses as much as digits as its factorization.

44128709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 44128709 is about 6642.9443020396. The cubic root of 44128709 is about 353.3787314596.

The spelling of 44128709 in words is "forty-four million, one hundred twenty-eight thousand, seven hundred nine".