428669 has 4 divisors (see below), whose sum is σ = 430140. Its totient is φ = 427200.

The previous prime is 428663. The next prime is 428671. The reversal of 428669 is 966824.

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

It can be written as a sum of positive squares in 2 ways, for example, as 344569 + 84100 = 587^2 + 290^2 .

It is a cyclic number.

It is not a de Polignac number, because 428669 - 2¹² = 424573 is a prime.

It is a super-2 number, since 2×428669² = 367514223122, which contains 22 as substring.

It is a d-powerful number, because it can be written as 4⁷ + 2¹⁷ + 6² + 8³ + 6⁷ + 9³ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428663) 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, 134 + ... + 935.

It is an arithmetic number, because the mean of its divisors is an integer number (107535).

2⁴²⁸⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

428669 is a deficient number, since it is larger than the sum of its proper divisors (1471).

428669 is a wasteful number, since it uses less digits than its factorization.

428669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1470.

The product of its digits is 20736, while the sum is 35.

The square root of 428669 is about 654.7281878765. The cubic root of 428669 is about 75.4004653021.

It can be divided in two parts, 42866 and 9, that added together give a cube (42875 = 35³).

The spelling of 428669 in words is "four hundred twenty-eight thousand, six hundred sixty-nine".