645365 has 8 divisors (see below), whose sum is σ = 885120. Its totient is φ = 442512.

The previous prime is 645353. The next prime is 645367. The reversal of 645365 is 563546.

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

It is not a de Polignac number, because 645365 - 2¹⁰ = 644341 is a prime.

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 645365.

It is not an unprimeable number, because it can be changed into a prime (645367) 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, 9185 + ... + 9254.

It is an arithmetic number, because the mean of its divisors is an integer number (110640).

2⁶⁴⁵³⁶⁵ is an apocalyptic number.

It is an amenable number.

645365 is a deficient number, since it is larger than the sum of its proper divisors (239755).

645365 is a wasteful number, since it uses less digits than its factorization.

645365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18451.

The product of its digits is 10800, while the sum is 29.

The square root of 645365 is about 803.3461271457. The cubic root of 645365 is about 86.4175208095.

The spelling of 645365 in words is "six hundred forty-five thousand, three hundred sixty-five".