628421 has 8 divisors (see below), whose sum is σ = 653184. Its totient is φ = 604240.

The previous prime is 628399. The next prime is 628423. The reversal of 628421 is 124826.

628421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 628421 - 2⁶ = 628357 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 (628423) 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, 3680 + ... + 3846.

It is an arithmetic number, because the mean of its divisors is an integer number (81648).

2⁶²⁸⁴²¹ is an apocalyptic number.

It is an amenable number.

628421 is a deficient number, since it is larger than the sum of its proper divisors (24763).

628421 is a wasteful number, since it uses less digits than its factorization.

628421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291.

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

The square root of 628421 is about 792.7300927806. The cubic root of 628421 is about 85.6545089831.

The spelling of 628421 in words is "six hundred twenty-eight thousand, four hundred twenty-one".