628775 has 12 divisors (see below), whose sum is σ = 891312. Its totient is φ = 431040.

The previous prime is 628759. The next prime is 628781. The reversal of 628775 is 577826.

It is not a de Polignac number, because 628775 - 2⁴ = 628759 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

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 11 ways as a sum of consecutive naturals, for example, 1622 + ... + 1971.

It is an arithmetic number, because the mean of its divisors is an integer number (74276).

2⁶²⁸⁷⁷⁵ is an apocalyptic number.

628775 is a deficient number, since it is larger than the sum of its proper divisors (262537).

628775 is a wasteful number, since it uses less digits than its factorization.

628775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3610 (or 3605 counting only the distinct ones).

The product of its digits is 23520, while the sum is 35.

The square root of 628775 is about 792.9533403675. The cubic root of 628775 is about 85.6705895004.

The spelling of 628775 in words is "six hundred twenty-eight thousand, seven hundred seventy-five".