645288 has 64 divisors (see below), whose sum is σ = 1935360. Its totient is φ = 175296.

The previous prime is 645257. The next prime is 645313. The reversal of 645288 is 882546.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 645288.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3781 + ... + 3947.

It is an arithmetic number, because the mean of its divisors is an integer number (30240).

2⁶⁴⁵²⁸⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (967680).

645288 is an abundant number, since it is smaller than the sum of its proper divisors (1290072).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645288 is a wasteful number, since it uses less digits than its factorization.

645288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206 (or 202 counting only the distinct ones).

The product of its digits is 15360, while the sum is 33.

The square root of 645288 is about 803.2982011682. The cubic root of 645288 is about 86.4140837809.

The spelling of 645288 in words is "six hundred forty-five thousand, two hundred eighty-eight".