609645 has 16 divisors (see below), whose sum is σ = 987840. Its totient is φ = 321024.

The previous prime is 609641. The next prime is 609673. The reversal of 609645 is 546906.

It is not a de Polignac number, because 609645 - 2² = 609641 is a prime.

It is a super-3 number, since 3×609645³ = 679754832243033375, which contains 333 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (609641) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1246 + ... + 1664.

It is an arithmetic number, because the mean of its divisors is an integer number (61740).

2⁶⁰⁹⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

609645 is a deficient number, since it is larger than the sum of its proper divisors (378195).

609645 is a wasteful number, since it uses less digits than its factorization.

609645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 609645 is about 780.7976690539. The cubic root of 609645 is about 84.7928056226.

The spelling of 609645 in words is "six hundred nine thousand, six hundred forty-five".