628784 has 20 divisors (see below), whose sum is σ = 1312416. Its totient is φ = 290112.

The previous prime is 628783. The next prime is 628787. The reversal of 628784 is 487826.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (628781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1304 + ... + 1719.

2⁶²⁸⁷⁸⁴ is an apocalyptic number.

It is an amenable number.

628784 is an abundant number, since it is smaller than the sum of its proper divisors (683632).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

628784 is a wasteful number, since it uses less digits than its factorization.

628784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3044 (or 3038 counting only the distinct ones).

The product of its digits is 21504, while the sum is 35.

The square root of 628784 is about 792.9590153343. The cubic root of 628784 is about 85.6709982484.

The spelling of 628784 in words is "six hundred twenty-eight thousand, seven hundred eighty-four".