645848 has 32 divisors (see below), whose sum is σ = 1459200. Its totient is φ = 261792.

The previous prime is 645839. The next prime is 645851. The reversal of 645848 is 848546.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 645848.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 761 + ... + 1367.

It is an arithmetic number, because the mean of its divisors is an integer number (45600).

2⁶⁴⁵⁸⁴⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (729600).

645848 is an abundant number, since it is smaller than the sum of its proper divisors (813352).

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

645848 is a wasteful number, since it uses less digits than its factorization.

645848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639 (or 635 counting only the distinct ones).

The product of its digits is 30720, while the sum is 35.

The square root of 645848 is about 803.6466885392. The cubic root of 645848 is about 86.4390741186.

It can be divided in two parts, 6 and 45848, that added together give a palindrome (45854).

The spelling of 645848 in words is "six hundred forty-five thousand, eight hundred forty-eight".