428621 has 8 divisors (see below), whose sum is σ = 478080. Its totient is φ = 381888.

The previous prime is 428579. The next prime is 428629. The reversal of 428621 is 126824.

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

It is not a de Polignac number, because 428621 - 2⁶ = 428557 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 (428629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 341 + ... + 986.

It is an arithmetic number, because the mean of its divisors is an integer number (59760).

2⁴²⁸⁶²¹ is an apocalyptic number.

It is an amenable number.

428621 is a deficient number, since it is larger than the sum of its proper divisors (49459).

428621 is a wasteful number, since it uses less digits than its factorization.

428621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1363.

The product of its digits is 768, while the sum is 23.

The square root of 428621 is about 654.6915304172. The cubic root of 428621 is about 75.3976508871.

The spelling of 428621 in words is "four hundred twenty-eight thousand, six hundred twenty-one".