628945 has 4 divisors (see below), whose sum is σ = 754740. Its totient is φ = 503152.

The previous prime is 628939. The next prime is 628973. The reversal of 628945 is 549826.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 258064 + 370881 = 508^2 + 609^2 .

It is a cyclic number.

It is not a de Polignac number, because 628945 - 2³ = 628937 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 628945.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62890 + ... + 62899.

It is an arithmetic number, because the mean of its divisors is an integer number (188685).

2⁶²⁸⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

628945 is a deficient number, since it is larger than the sum of its proper divisors (125795).

628945 is a wasteful number, since it uses less digits than its factorization.

628945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125794.

The product of its digits is 17280, while the sum is 34.

The square root of 628945 is about 793.0605273244. The cubic root of 628945 is about 85.6783096377.

The spelling of 628945 in words is "six hundred twenty-eight thousand, nine hundred forty-five".