428013689 has 2 divisors, whose sum is σ = 428013690. Its totient is φ = 428013688.

The previous prime is 428013667. The next prime is 428013731. The reversal of 428013689 is 986310824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 350925289 + 77088400 = 18733^2 + 8780^2 .

It is a cyclic number.

It is not a de Polignac number, because 428013689 - 2⁸ = 428013433 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (428013629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214006844 + 214006845.

It is an arithmetic number, because the mean of its divisors is an integer number (214006845).

Almost surely, 2^428013689 is an apocalyptic number.

It is an amenable number.

428013689 is a deficient number, since it is larger than the sum of its proper divisors (1).

428013689 is an equidigital number, since it uses as much as digits as its factorization.

428013689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 428013689 is about 20688.4917043268. The cubic root of 428013689 is about 753.6202386753.

The spelling of 428013689 in words is "four hundred twenty-eight million, thirteen thousand, six hundred eighty-nine".