646280 has 32 divisors (see below), whose sum is σ = 1477440. Its totient is φ = 254400.

The previous prime is 646273. The next prime is 646291. The reversal of 646280 is 82646.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is a nialpdrome in base 15.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4205 + ... + 4355.

It is an arithmetic number, because the mean of its divisors is an integer number (46170).

2⁶⁴⁶²⁸⁰ is an apocalyptic number.

It is an amenable number.

646280 is an abundant number, since it is smaller than the sum of its proper divisors (831160).

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

646280 is a wasteful number, since it uses less digits than its factorization.

646280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269 (or 265 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 646280 is about 803.9154184365. The cubic root of 646280 is about 86.4583425106.

The spelling of 646280 in words is "six hundred forty-six thousand, two hundred eighty".