428667 has 8 divisors (see below), whose sum is σ = 585024. Its totient is φ = 279048.

The previous prime is 428663. The next prime is 428671. The reversal of 428667 is 766824.

It is an interprime number because it is at equal distance from previous prime (428663) and next prime (428671).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 428667 - 2² = 428663 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 1533 + ... + 1790.

It is an arithmetic number, because the mean of its divisors is an integer number (73128).

2⁴²⁸⁶⁶⁷ is an apocalyptic number.

428667 is a deficient number, since it is larger than the sum of its proper divisors (156357).

428667 is a wasteful number, since it uses less digits than its factorization.

428667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3369.

The product of its digits is 16128, while the sum is 33.

The square root of 428667 is about 654.7266605233. The cubic root of 428667 is about 75.4003480390.

The spelling of 428667 in words is "four hundred twenty-eight thousand, six hundred sixty-seven".