628897 has 4 divisors (see below), whose sum is σ = 649216. Its totient is φ = 608580.

The previous prime is 628877. The next prime is 628909. The reversal of 628897 is 798826.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628897 is a prime.

It is a super-2 number, since 2×628897² = 791022873218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10113 + ... + 10174.

It is an arithmetic number, because the mean of its divisors is an integer number (162304).

2⁶²⁸⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

628897 is a deficient number, since it is larger than the sum of its proper divisors (20319).

628897 is a wasteful number, since it uses less digits than its factorization.

628897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20318.

The product of its digits is 48384, while the sum is 40.

The square root of 628897 is about 793.0302642396. The cubic root of 628897 is about 85.6761299752.

The spelling of 628897 in words is "six hundred twenty-eight thousand, eight hundred ninety-seven".