728780189 has 2 divisors, whose sum is σ = 728780190. Its totient is φ = 728780188.

The previous prime is 728780183. The next prime is 728780201. The reversal of 728780189 is 981087827.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 423124900 + 305655289 = 20570^2 + 17483^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-728780189 is a prime.

It is a super-2 number, since 2×728780189² = 1062241127757751442, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728780183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364390094 + 364390095.

It is an arithmetic number, because the mean of its divisors is an integer number (364390095).

Almost surely, 2^728780189 is an apocalyptic number.

It is an amenable number.

728780189 is a deficient number, since it is larger than the sum of its proper divisors (1).

728780189 is an equidigital number, since it uses as much as digits as its factorization.

728780189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 451584, while the sum is 50.

The square root of 728780189 is about 26995.9291190357. The cubic root of 728780189 is about 899.9095337052.

The spelling of 728780189 in words is "seven hundred twenty-eight million, seven hundred eighty thousand, one hundred eighty-nine".