605645 has 8 divisors (see below), whose sum is σ = 735480. Its totient is φ = 478720.

The previous prime is 605641. The next prime is 605687. The reversal of 605645 is 546506.

It can be written as a sum of positive squares in 4 ways, for example, as 361 + 605284 = 19^2 + 778^2 .

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

It is not a de Polignac number, because 605645 - 2² = 605641 is a prime.

It is a super-3 number, since 3×605645³ = 666462416186133375, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (605641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236 + ... + 1125.

It is an arithmetic number, because the mean of its divisors is an integer number (91935).

2⁶⁰⁵⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

605645 is a deficient number, since it is larger than the sum of its proper divisors (129835).

605645 is a wasteful number, since it uses less digits than its factorization.

605645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1455.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 605645 is about 778.2319705589. The cubic root of 605645 is about 84.6069511620.

The spelling of 605645 in words is "six hundred five thousand, six hundred forty-five".