728244109 has 2 divisors, whose sum is σ = 728244110. Its totient is φ = 728244108.

The previous prime is 728244071. The next prime is 728244119. The reversal of 728244109 is 901442827.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 562401225 + 165842884 = 23715^2 + 12878^2 .

It is an emirp because it is prime and its reverse (901442827) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 728244109 - 2¹¹ = 728242061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728244119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364122054 + 364122055.

It is an arithmetic number, because the mean of its divisors is an integer number (364122055).

Almost surely, 2^728244109 is an apocalyptic number.

It is an amenable number.

728244109 is a deficient number, since it is larger than the sum of its proper divisors (1).

728244109 is an equidigital number, since it uses as much as digits as its factorization.

728244109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 728244109 is about 26985.9983880530. The cubic root of 728244109 is about 899.6888261693.

The spelling of 728244109 in words is "seven hundred twenty-eight million, two hundred forty-four thousand, one hundred nine".