428861 has 4 divisors (see below), whose sum is σ = 434112. Its totient is φ = 423612.

The previous prime is 428851. The next prime is 428863. The reversal of 428861 is 168824.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 428861 - 2⁶ = 428797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428863) 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, 2501 + ... + 2666.

It is an arithmetic number, because the mean of its divisors is an integer number (108528).

2⁴²⁸⁸⁶¹ is an apocalyptic number.

It is an amenable number.

428861 is a deficient number, since it is larger than the sum of its proper divisors (5251).

428861 is an equidigital number, since it uses as much as digits as its factorization.

428861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5250.

The product of its digits is 3072, while the sum is 29.

The square root of 428861 is about 654.8747971941. The cubic root of 428861 is about 75.4117208618.

The spelling of 428861 in words is "four hundred twenty-eight thousand, eight hundred sixty-one".