428752217 has 2 divisors, whose sum is σ = 428752218. Its totient is φ = 428752216.

The previous prime is 428752213. The next prime is 428752231. The reversal of 428752217 is 712257824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 277855561 + 150896656 = 16669^2 + 12284^2 .

It is a cyclic number.

It is not a de Polignac number, because 428752217 - 2² = 428752213 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (428752213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214376108 + 214376109.

It is an arithmetic number, because the mean of its divisors is an integer number (214376109).

Almost surely, 2^428752217 is an apocalyptic number.

It is an amenable number.

428752217 is a deficient number, since it is larger than the sum of its proper divisors (1).

428752217 is an equidigital number, since it uses as much as digits as its factorization.

428752217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62720, while the sum is 38.

The square root of 428752217 is about 20706.3327752647. The cubic root of 428752217 is about 754.0534412046.

The spelling of 428752217 in words is "four hundred twenty-eight million, seven hundred fifty-two thousand, two hundred seventeen".