644262 has 8 divisors (see below), whose sum is σ = 1288536. Its totient is φ = 214752.

The previous prime is 644261. The next prime is 644291. The reversal of 644262 is 262446.

644262 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

644262 is an admirable number.

It is a d-powerful number, because it can be written as 6⁵ + 4 + 2 + 4⁸ + 6⁶ + 2¹⁹ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53683 + ... + 53694.

It is an arithmetic number, because the mean of its divisors is an integer number (161067).

2⁶⁴⁴²⁶² is an apocalyptic number.

644262 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

644262 is a wasteful number, since it uses less digits than its factorization.

644262 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107382.

The product of its digits is 2304, while the sum is 24.

The square root of 644262 is about 802.6593299775. The cubic root of 644262 is about 86.3682603753.

The spelling of 644262 in words is "six hundred forty-four thousand, two hundred sixty-two".