645932 has 48 divisors (see below), whose sum is σ = 1451520. Its totient is φ = 244992.

The previous prime is 645907. The next prime is 645937. The reversal of 645932 is 239546.

Its product of digits (6480) is a multiple of the sum of its prime divisors (108).

It is a junction number, because it is equal to n+sod(n) for n = 645895 and 645904.

It is not an unprimeable number, because it can be changed into a prime (645937) by changing a digit.

645932 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10919 + ... + 10977.

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

2⁶⁴⁵⁹³² 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 645932, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (725760).

645932 is an abundant number, since it is smaller than the sum of its proper divisors (805588).

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

645932 is a wasteful number, since it uses less digits than its factorization.

645932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110 (or 108 counting only the distinct ones).

The product of its digits is 6480, while the sum is 29.

The square root of 645932 is about 803.6989486120. The cubic root of 645932 is about 86.4428214232.

The spelling of 645932 in words is "six hundred forty-five thousand, nine hundred thirty-two".