628651 has 2 divisors, whose sum is σ = 628652. Its totient is φ = 628650.

The previous prime is 628591. The next prime is 628673. The reversal of 628651 is 156826.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 628651 - 2⁹ = 628139 is a prime.

628651 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (628681) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314325 + 314326.

It is an arithmetic number, because the mean of its divisors is an integer number (314326).

2⁶²⁸⁶⁵¹ is an apocalyptic number.

628651 is a deficient number, since it is larger than the sum of its proper divisors (1).

628651 is an equidigital number, since it uses as much as digits as its factorization.

628651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 28.

The square root of 628651 is about 792.8751478007. The cubic root of 628651 is about 85.6649574638.

The spelling of 628651 in words is "six hundred twenty-eight thousand, six hundred fifty-one".