224128709 has 4 divisors (see below), whose sum is σ = 256147104. Its totient is φ = 192110316.

The previous prime is 224128699. The next prime is 224128739. The reversal of 224128709 is 907821422.

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 a cyclic number.

It is not a de Polignac number, because 224128709 - 2¹⁶ = 224063173 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 (224128739) 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, 16009187 + ... + 16009200.

It is an arithmetic number, because the mean of its divisors is an integer number (64036776).

Almost surely, 2^224128709 is an apocalyptic number.

It is an amenable number.

224128709 is a deficient number, since it is larger than the sum of its proper divisors (32018395).

224128709 is an equidigital number, since it uses as much as digits as its factorization.

224128709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32018394.

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

The square root of 224128709 is about 14970.9287955023. The cubic root of 224128709 is about 607.4340924396.

The spelling of 224128709 in words is "two hundred twenty-four million, one hundred twenty-eight thousand, seven hundred nine".