428856817 has 2 divisors, whose sum is σ = 428856818. Its totient is φ = 428856816.

The previous prime is 428856803. The next prime is 428856853. The reversal of 428856817 is 718658824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 372065521 + 56791296 = 19289^2 + 7536^2 .

It is a cyclic number.

It is not a de Polignac number, because 428856817 - 2¹⁵ = 428824049 is a prime.

It is not a weakly prime, because it can be changed into another prime (428856217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214428408 + 214428409.

It is an arithmetic number, because the mean of its divisors is an integer number (214428409).

Almost surely, 2^428856817 is an apocalyptic number.

It is an amenable number.

428856817 is a deficient number, since it is larger than the sum of its proper divisors (1).

428856817 is an equidigital number, since it uses as much as digits as its factorization.

428856817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 860160, while the sum is 49.

The square root of 428856817 is about 20708.8584185609. The cubic root of 428856817 is about 754.1147567878.

The spelling of 428856817 in words is "four hundred twenty-eight million, eight hundred fifty-six thousand, eight hundred seventeen".