428767 has 4 divisors (see below), whose sum is σ = 431656. Its totient is φ = 425880.

The previous prime is 428759. The next prime is 428777. The reversal of 428767 is 767824.

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 428767 - 2³ = 428759 is a prime.

It is a super-2 number, since 2×428767² = 367682280578, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1209 + ... + 1522.

It is an arithmetic number, because the mean of its divisors is an integer number (107914).

2⁴²⁸⁷⁶⁷ is an apocalyptic number.

428767 is a deficient number, since it is larger than the sum of its proper divisors (2889).

428767 is a wasteful number, since it uses less digits than its factorization.

428767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2888.

The product of its digits is 18816, while the sum is 34.

The square root of 428767 is about 654.8030238171. The cubic root of 428767 is about 75.4062107472.

The spelling of 428767 in words is "four hundred twenty-eight thousand, seven hundred sixty-seven".