428689 has 8 divisors (see below), whose sum is σ = 459648. Its totient is φ = 398400.

The previous prime is 428683. The next prime is 428693. The reversal of 428689 is 986824.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 428689 - 2⁵ = 428657 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2484 + ... + 2650.

It is an arithmetic number, because the mean of its divisors is an integer number (57456).

2⁴²⁸⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

428689 is a deficient number, since it is larger than the sum of its proper divisors (30959).

428689 is a wasteful number, since it uses less digits than its factorization.

428689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335.

The product of its digits is 27648, while the sum is 37.

The square root of 428689 is about 654.7434612121. The cubic root of 428689 is about 75.4016379130.

The spelling of 428689 in words is "four hundred twenty-eight thousand, six hundred eighty-nine".