428071 has 4 divisors (see below), whose sum is σ = 489232. Its totient is φ = 366912.

The previous prime is 428047. The next prime is 428083. The reversal of 428071 is 170824.

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

It is not a de Polignac number, because 428071 - 2⁵ = 428039 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 (428041) 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, 30570 + ... + 30583.

It is an arithmetic number, because the mean of its divisors is an integer number (122308).

2⁴²⁸⁰⁷¹ is an apocalyptic number.

428071 is a deficient number, since it is larger than the sum of its proper divisors (61161).

428071 is an equidigital number, since it uses as much as digits as its factorization.

428071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61160.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 428071 is about 654.2713504350. The cubic root of 428071 is about 75.3653873738.

Adding to 428071 its reverse (170824), we get a palindrome (598895).

The spelling of 428071 in words is "four hundred twenty-eight thousand, seventy-one".