428687 has 8 divisors (see below), whose sum is σ = 500736. Its totient is φ = 359352.

The previous prime is 428683. The next prime is 428693. The reversal of 428687 is 786824.

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

It is not a de Polignac number, because 428687 - 2² = 428683 is a prime.

It is a Duffinian number.

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 428687.

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, 323 + ... + 980.

It is an arithmetic number, because the mean of its divisors is an integer number (62592).

2⁴²⁸⁶⁸⁷ is an apocalyptic number.

428687 is a gapful number since it is divisible by the number (47) formed by its first and last digit.

428687 is a deficient number, since it is larger than the sum of its proper divisors (72049).

428687 is a wasteful number, since it uses less digits than its factorization.

428687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357.

The product of its digits is 21504, while the sum is 35.

The square root of 428687 is about 654.7419338946. The cubic root of 428687 is about 75.4015206536.

It can be divided in two parts, 42868 and 7, that added together give a cube (42875 = 35³).

The spelling of 428687 in words is "four hundred twenty-eight thousand, six hundred eighty-seven".