428779 has 4 divisors (see below), whose sum is σ = 461776. Its totient is φ = 395784.

The previous prime is 428777. The next prime is 428797. The reversal of 428779 is 977824.

It is a happy number.

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 428779 - 2¹ = 428777 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 16479 + ... + 16504.

It is an arithmetic number, because the mean of its divisors is an integer number (115444).

2⁴²⁸⁷⁷⁹ is an apocalyptic number.

428779 is a deficient number, since it is larger than the sum of its proper divisors (32997).

428779 is a wasteful number, since it uses less digits than its factorization.

428779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32996.

The product of its digits is 28224, while the sum is 37.

The square root of 428779 is about 654.8121868139. The cubic root of 428779 is about 75.4069142109.

The spelling of 428779 in words is "four hundred twenty-eight thousand, seven hundred seventy-nine".