428087 has 4 divisors (see below), whose sum is σ = 467016. Its totient is φ = 389160.

The previous prime is 428083. The next prime is 428093. The reversal of 428087 is 780824.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 428087 - 2² = 428083 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 428087.

It is not an unprimeable number, because it can be changed into a prime (428083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19448 + ... + 19469.

It is an arithmetic number, because the mean of its divisors is an integer number (116754).

2⁴²⁸⁰⁸⁷ is an apocalyptic number.

428087 is a deficient number, since it is larger than the sum of its proper divisors (38929).

428087 is a wasteful number, since it uses less digits than its factorization.

428087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38928.

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 428087 is about 654.2835776634. The cubic root of 428087 is about 75.3663263389.

The spelling of 428087 in words is "four hundred twenty-eight thousand, eighty-seven".