428306689 has 2 divisors, whose sum is σ = 428306690. Its totient is φ = 428306688.

The previous prime is 428306647. The next prime is 428306693. The reversal of 428306689 is 986603824.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 425184400 + 3122289 = 20620^2 + 1767^2 .

It is a cyclic number.

It is not a de Polignac number, because 428306689 - 2¹⁵ = 428273921 is a prime.

It is not a weakly prime, because it can be changed into another prime (428306639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214153344 + 214153345.

It is an arithmetic number, because the mean of its divisors is an integer number (214153345).

Almost surely, 2^428306689 is an apocalyptic number.

It is an amenable number.

428306689 is a deficient number, since it is larger than the sum of its proper divisors (1).

428306689 is an equidigital number, since it uses as much as digits as its factorization.

428306689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 497664, while the sum is 46.

The square root of 428306689 is about 20695.5717244052. The cubic root of 428306689 is about 753.7921649235.

The spelling of 428306689 in words is "four hundred twenty-eight million, three hundred six thousand, six hundred eighty-nine".