646290 has 48 divisors (see below), whose sum is σ = 1729728. Its totient is φ = 167328.

The previous prime is 646273. The next prime is 646291. The reversal of 646290 is 92646.

646290 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646291) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3787 + ... + 3953.

It is an arithmetic number, because the mean of its divisors is an integer number (36036).

2⁶⁴⁶²⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (864864).

646290 is an abundant number, since it is smaller than the sum of its proper divisors (1083438).

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

646290 is a wasteful number, since it uses less digits than its factorization.

646290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 646290 is about 803.9216379723. The cubic root of 646290 is about 86.4587884365.

The spelling of 646290 in words is "six hundred forty-six thousand, two hundred ninety".