628997 has 2 divisors, whose sum is σ = 628998. Its totient is φ = 628996.

The previous prime is 628993. The next prime is 629003. The reversal of 628997 is 799826.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 591361 + 37636 = 769^2 + 194^2 .

It is a cyclic number.

It is not a de Polignac number, because 628997 - 2² = 628993 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314498 + 314499.

It is an arithmetic number, because the mean of its divisors is an integer number (314499).

2⁶²⁸⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

628997 is a deficient number, since it is larger than the sum of its proper divisors (1).

628997 is an equidigital number, since it uses as much as digits as its factorization.

628997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 41.

The square root of 628997 is about 793.0933110297. The cubic root of 628997 is about 85.6806708135.

The spelling of 628997 in words is "six hundred twenty-eight thousand, nine hundred ninety-seven".