428787 has 8 divisors (see below), whose sum is σ = 635280. Its totient is φ = 285840.

The previous prime is 428777. The next prime is 428797. The reversal of 428787 is 787824.

It is an interprime number because it is at equal distance from previous prime (428777) and next prime (428797).

It is not a de Polignac number, because 428787 - 2⁸ = 428531 is a prime.

428787 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 428787.

It is not an unprimeable number, because it can be changed into a prime (428777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7914 + ... + 7967.

It is an arithmetic number, because the mean of its divisors is an integer number (79410).

2⁴²⁸⁷⁸⁷ is an apocalyptic number.

428787 is a deficient number, since it is larger than the sum of its proper divisors (206493).

428787 is a wasteful number, since it uses less digits than its factorization.

428787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15890 (or 15884 counting only the distinct ones).

The product of its digits is 25088, while the sum is 36.

The square root of 428787 is about 654.8182954072. The cubic root of 428787 is about 75.4073831794.

The spelling of 428787 in words is "four hundred twenty-eight thousand, seven hundred eighty-seven".