645585 has 16 divisors (see below), whose sum is σ = 1042944. Its totient is φ = 340992.

The previous prime is 645583. The next prime is 645599. The reversal of 645585 is 585546.

It is not a de Polignac number, because 645585 - 2¹ = 645583 is a prime.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (645581) 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, 2784 + ... + 3006.

It is an arithmetic number, because the mean of its divisors is an integer number (65184).

2⁶⁴⁵⁵⁸⁵ is an apocalyptic number.

It is an amenable number.

645585 is a deficient number, since it is larger than the sum of its proper divisors (397359).

645585 is a wasteful number, since it uses less digits than its factorization.

645585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424.

The product of its digits is 24000, while the sum is 33.

The square root of 645585 is about 803.4830427582. The cubic root of 645585 is about 86.4273393848.

The spelling of 645585 in words is "six hundred forty-five thousand, five hundred eighty-five".