645596 has 12 divisors (see below), whose sum is σ = 1291248. Its totient is φ = 276672.

The previous prime is 645583. The next prime is 645599. The reversal of 645596 is 695546.

It is a happy number.

645596 is nontrivially palindromic in base 6.

645596 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645599) by changing a digit.

645596 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11501 + ... + 11556.

It is an arithmetic number, because the mean of its divisors is an integer number (107604).

2⁶⁴⁵⁵⁹⁶ is an apocalyptic number.

It is an amenable number.

645596 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.

645596 is a wasteful number, since it uses less digits than its factorization.

645596 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23068 (or 23066 counting only the distinct ones).

The product of its digits is 32400, while the sum is 35.

The square root of 645596 is about 803.4898879264. The cubic root of 645596 is about 86.4278302550.

The spelling of 645596 in words is "six hundred forty-five thousand, five hundred ninety-six".