428679 has 8 divisors (see below), whose sum is σ = 635120. Its totient is φ = 285768.

The previous prime is 428677. The next prime is 428683. The reversal of 428679 is 976824.

It is not a de Polignac number, because 428679 - 2¹ = 428677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428671) 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, 7912 + ... + 7965.

It is an arithmetic number, because the mean of its divisors is an integer number (79390).

2⁴²⁸⁶⁷⁹ is an apocalyptic number.

428679 is a deficient number, since it is larger than the sum of its proper divisors (206441).

428679 is a wasteful number, since it uses less digits than its factorization.

428679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15886 (or 15880 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 428679 is about 654.7358245888. The cubic root of 428679 is about 75.4010516121.

The spelling of 428679 in words is "four hundred twenty-eight thousand, six hundred seventy-nine".