428685 has 8 divisors (see below), whose sum is σ = 685920. Its totient is φ = 228624.

The previous prime is 428683. The next prime is 428693. The reversal of 428685 is 586824.

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

It is not a de Polignac number, because 428685 - 2¹ = 428683 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 428685.

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, 14275 + ... + 14304.

It is an arithmetic number, because the mean of its divisors is an integer number (85740).

2⁴²⁸⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

428685 is a deficient number, since it is larger than the sum of its proper divisors (257235).

428685 is a wasteful number, since it uses less digits than its factorization.

428685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28587.

The product of its digits is 15360, while the sum is 33.

The square root of 428685 is about 654.7404065735. The cubic root of 428685 is about 75.4014033938.

It can be divided in two parts, 4286 and 85, that added together give a triangular number (4371 = T₉₃).

The spelling of 428685 in words is "four hundred twenty-eight thousand, six hundred eighty-five".