628690 has 8 divisors (see below), whose sum is σ = 1131660. Its totient is φ = 251472.

The previous prime is 628687. The next prime is 628699. The reversal of 628690 is 96826.

It can be written as a sum of positive squares in 2 ways, for example, as 588289 + 40401 = 767^2 + 201^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×628690² = 790502232200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (628699) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 31425 + ... + 31444.

2⁶²⁸⁶⁹⁰ is an apocalyptic number.

628690 is a deficient number, since it is larger than the sum of its proper divisors (502970).

628690 is a wasteful number, since it uses less digits than its factorization.

628690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62876.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 628690 is about 792.8997414554. The cubic root of 628690 is about 85.6667289100. Note that the first 3 decimals are identical.

The spelling of 628690 in words is "six hundred twenty-eight thousand, six hundred ninety".