428232689 has 2 divisors, whose sum is σ = 428232690. Its totient is φ = 428232688.

The previous prime is 428232661. The next prime is 428232713. The reversal of 428232689 is 986232824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 379470400 + 48762289 = 19480^2 + 6983^2 .

It is a cyclic number.

It is not a de Polignac number, because 428232689 - 2⁸ = 428232433 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (428232289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214116344 + 214116345.

It is an arithmetic number, because the mean of its divisors is an integer number (214116345).

Almost surely, 2^428232689 is an apocalyptic number.

It is an amenable number.

428232689 is a deficient number, since it is larger than the sum of its proper divisors (1).

428232689 is an equidigital number, since it uses as much as digits as its factorization.

428232689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 331776, while the sum is 44.

The square root of 428232689 is about 20693.7838251007. The cubic root of 428232689 is about 753.7487506798.

The spelling of 428232689 in words is "four hundred twenty-eight million, two hundred thirty-two thousand, six hundred eighty-nine".