628885 has 4 divisors (see below), whose sum is σ = 754668. Its totient is φ = 503104.

The previous prime is 628877. The next prime is 628909. The reversal of 628885 is 588826.

628885 = T₆₄₆ + T₆₄₇ + T₆₄₈.

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 221841 + 407044 = 471^2 + 638^2 .

It is a cyclic number.

It is not a de Polignac number, because 628885 - 2³ = 628877 is a prime.

It is a Duffinian number.

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, 62884 + ... + 62893.

It is an arithmetic number, because the mean of its divisors is an integer number (188667).

2⁶²⁸⁸⁸⁵ is an apocalyptic number.

628885 is the 648-th centered triangular number.

It is an amenable number.

628885 is a deficient number, since it is larger than the sum of its proper divisors (125783).

628885 is a wasteful number, since it uses less digits than its factorization.

628885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125782.

The product of its digits is 30720, while the sum is 37.

The square root of 628885 is about 793.0226982880. The cubic root of 628885 is about 85.6755850422.

The spelling of 628885 in words is "six hundred twenty-eight thousand, eight hundred eighty-five".