628765 has 4 divisors (see below), whose sum is σ = 754524. Its totient is φ = 503008.

The previous prime is 628759. The next prime is 628781. The reversal of 628765 is 567826.

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 436921 + 191844 = 661^2 + 438^2 .

It is a cyclic number.

It is not a de Polignac number, because 628765 - 2³ = 628757 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 628765.

It is a congruent number.

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, 62872 + ... + 62881.

It is an arithmetic number, because the mean of its divisors is an integer number (188631).

2⁶²⁸⁷⁶⁵ is an apocalyptic number.

It is an amenable number.

628765 is a deficient number, since it is larger than the sum of its proper divisors (125759).

628765 is a wasteful number, since it uses less digits than its factorization.

628765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125758.

The product of its digits is 20160, while the sum is 34.

The square root of 628765 is about 792.9470348012. The cubic root of 628765 is about 85.6701353314.

The spelling of 628765 in words is "six hundred twenty-eight thousand, seven hundred sixty-five".