645332 has 6 divisors (see below), whose sum is σ = 1129338. Its totient is φ = 322664.

The previous prime is 645329. The next prime is 645347. The reversal of 645332 is 233546.

645332 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 only one way, i.e., 456976 + 188356 = 676^2 + 434^2 .

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 645298 and 645307.

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 645332.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80663 + ... + 80670.

It is an arithmetic number, because the mean of its divisors is an integer number (188223).

2⁶⁴⁵³³² is an apocalyptic number.

It is an amenable number.

645332 is a deficient number, since it is larger than the sum of its proper divisors (484006).

645332 is a wasteful number, since it uses less digits than its factorization.

645332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161337 (or 161335 counting only the distinct ones).

The product of its digits is 2160, while the sum is 23.

The square root of 645332 is about 803.3255877912. The cubic root of 645332 is about 86.4160478307.

Adding to 645332 its reverse (233546), we get a palindrome (878878).

The spelling of 645332 in words is "six hundred forty-five thousand, three hundred thirty-two".