628990 has 16 divisors (see below), whose sum is σ = 1169280. Its totient is φ = 243360.

The previous prime is 628973. The next prime is 628993. The reversal of 628990 is 99826.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 705 + ... + 1324.

It is an arithmetic number, because the mean of its divisors is an integer number (73080).

2⁶²⁸⁹⁹⁰ is an apocalyptic number.

628990 is a deficient number, since it is larger than the sum of its proper divisors (540290).

628990 is a wasteful number, since it uses less digits than its factorization.

628990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2067.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 628990 is about 793.0888979175. The cubic root of 628990 is about 85.6803529705.

The spelling of 628990 in words is "six hundred twenty-eight thousand, nine hundred ninety".