628417 has 4 divisors (see below), whose sum is σ = 630576. Its totient is φ = 626260.

The previous prime is 628399. The next prime is 628423. The reversal of 628417 is 714826.

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 628417 - 2⁷ = 628289 is a prime.

It is a Duffinian number.

628417 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (628427) 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, 559 + ... + 1252.

It is an arithmetic number, because the mean of its divisors is an integer number (157644).

2⁶²⁸⁴¹⁷ is an apocalyptic number.

It is an amenable number.

628417 is a deficient number, since it is larger than the sum of its proper divisors (2159).

628417 is a wasteful number, since it uses less digits than its factorization.

628417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2158.

The product of its digits is 2688, while the sum is 28.

The square root of 628417 is about 792.7275698498. The cubic root of 628417 is about 85.6543272478.

The spelling of 628417 in words is "six hundred twenty-eight thousand, four hundred seventeen".