428641 has 4 divisors (see below), whose sum is σ = 430000. Its totient is φ = 427284.

The previous prime is 428639. The next prime is 428657. The reversal of 428641 is 146824.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 428641 - 2¹ = 428639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428671) 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, 70 + ... + 928.

It is an arithmetic number, because the mean of its divisors is an integer number (107500).

2⁴²⁸⁶⁴¹ is an apocalyptic number.

It is an amenable number.

428641 is a deficient number, since it is larger than the sum of its proper divisors (1359).

428641 is an equidigital number, since it uses as much as digits as its factorization.

428641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1358.

The product of its digits is 1536, while the sum is 25.

The square root of 428641 is about 654.7068046080. The cubic root of 428641 is about 75.3988235856.

The spelling of 428641 in words is "four hundred twenty-eight thousand, six hundred forty-one".