645322 has 8 divisors (see below), whose sum is σ = 972900. Its totient is φ = 321024.

The previous prime is 645313. The next prime is 645329. The reversal of 645322 is 223546.

It is a happy number.

645322 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 641601 + 3721 = 801^2 + 61^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 645293 and 645302.

It is not an unprimeable number, because it can be changed into a prime (645329) by changing a digit.

645322 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247 + ... + 1162.

2⁶⁴⁵³²² is an apocalyptic number.

645322 is a deficient number, since it is larger than the sum of its proper divisors (327578).

645322 is a wasteful number, since it uses less digits than its factorization.

645322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1640.

The product of its digits is 1440, while the sum is 22.

The square root of 645322 is about 803.3193636406. The cubic root of 645322 is about 86.4156014636.

Adding to 645322 its reverse (223546), we get a palindrome (868868).

It can be divided in two parts, 645 and 322, that multiplied together give a triangular number (207690 = T₆₄₄).

The spelling of 645322 in words is "six hundred forty-five thousand, three hundred twenty-two".