628658 has 4 divisors (see below), whose sum is σ = 942990. Its totient is φ = 314328.

The previous prime is 628651. The next prime is 628673. The reversal of 628658 is 856826.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 344569 + 284089 = 587^2 + 533^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (628651) by changing a digit.

628658 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157163 + ... + 157166.

2⁶²⁸⁶⁵⁸ is an apocalyptic number.

628658 is a deficient number, since it is larger than the sum of its proper divisors (314332).

628658 is a wasteful number, since it uses less digits than its factorization.

628658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314331.

The product of its digits is 23040, while the sum is 35.

The square root of 628658 is about 792.8795621026. The cubic root of 628658 is about 85.6652754211.

The spelling of 628658 in words is "six hundred twenty-eight thousand, six hundred fifty-eight".