646338 has 32 divisors (see below), whose sum is σ = 1612800. Its totient is φ = 167760.

The previous prime is 646309. The next prime is 646339. The reversal of 646338 is 833646.

646338 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a d-powerful number, because it can be written as 6 + 4⁸ + 3⁷ + 6⁶ + 3¹² + 8³ .

It is not an unprimeable number, because it can be changed into a prime (646339) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 238 + ... + 1161.

It is an arithmetic number, because the mean of its divisors is an integer number (50400).

2⁶⁴⁶³³⁸ is an apocalyptic number.

646338 is an abundant number, since it is smaller than the sum of its proper divisors (966462).

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

646338 is a wasteful number, since it uses less digits than its factorization.

646338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1422.

The product of its digits is 10368, while the sum is 30.

The square root of 646338 is about 803.9514910739. The cubic root of 646338 is about 86.4609288168.

The spelling of 646338 in words is "six hundred forty-six thousand, three hundred thirty-eight".