628857 has 8 divisors (see below), whose sum is σ = 931680. Its totient is φ = 419220.

The previous prime is 628841. The next prime is 628861. The reversal of 628857 is 758826.

628857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 628857 - 2⁴ = 628841 is a prime.

It is a super-2 number, since 2×628857² = 790922252898, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 11619 + ... + 11672.

It is an arithmetic number, because the mean of its divisors is an integer number (116460).

628857 is a Friedman number, since it can be written as 68^(8-5)*2-7, using all its digits and the basic arithmetic operations.

2⁶²⁸⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

628857 is a deficient number, since it is larger than the sum of its proper divisors (302823).

628857 is a wasteful number, since it uses less digits than its factorization.

628857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23300 (or 23294 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 628857 is about 793.0050441201. The cubic root of 628857 is about 85.6743135050.

It can be divided in two parts, 628 and 857, that added together give a triangular number (1485 = T₅₄).

The spelling of 628857 in words is "six hundred twenty-eight thousand, eight hundred fifty-seven".