645285 has 8 divisors (see below), whose sum is σ = 1032480. Its totient is φ = 344144.

The previous prime is 645257. The next prime is 645313. The reversal of 645285 is 582546.

645285 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (645257) and next prime (645313).

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

It is a cyclic number.

It is not a de Polignac number, because 645285 - 2¹⁰ = 644261 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21495 + ... + 21524.

It is an arithmetic number, because the mean of its divisors is an integer number (129060).

2⁶⁴⁵²⁸⁵ is an apocalyptic number.

It is an amenable number.

645285 is a deficient number, since it is larger than the sum of its proper divisors (387195).

645285 is a wasteful number, since it uses less digits than its factorization.

645285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43027.

The product of its digits is 9600, while the sum is 30.

The square root of 645285 is about 803.2963338644. The cubic root of 645285 is about 86.4139498652.

The spelling of 645285 in words is "six hundred forty-five thousand, two hundred eighty-five".