646828 has 24 divisors (see below), whose sum is σ = 1393952. Its totient is φ = 255744.

The previous prime is 646823. The next prime is 646831. The reversal of 646828 is 828646.

It is a junction number, because it is equal to n+sod(n) for n = 646793 and 646802.

It is not an unprimeable number, because it can be changed into a prime (646823) 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, 525 + ... + 1252.

2⁶⁴⁶⁸²⁸ is an apocalyptic number.

It is an amenable number.

646828 is an abundant number, since it is smaller than the sum of its proper divisors (747124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646828 is a wasteful number, since it uses less digits than its factorization.

646828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1801 (or 1799 counting only the distinct ones).

The product of its digits is 18432, while the sum is 34.

The square root of 646828 is about 804.2561780925. The cubic root of 646828 is about 86.4827724721.

The spelling of 646828 in words is "six hundred forty-six thousand, eight hundred twenty-eight".