645832 has 32 divisors (see below), whose sum is σ = 1360800. Its totient is φ = 284800.

The previous prime is 645803. The next prime is 645833. The reversal of 645832 is 238546.

645832 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 645832.

It is not an unprimeable number, because it can be changed into a prime (645833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3519 + ... + 3697.

It is an arithmetic number, because the mean of its divisors is an integer number (42525).

2⁶⁴⁵⁸³² 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 645832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (680400).

645832 is an abundant number, since it is smaller than the sum of its proper divisors (714968).

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

645832 is a wasteful number, since it uses less digits than its factorization.

645832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237 (or 233 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 645832 is about 803.6367338543. The cubic root of 645832 is about 86.4383603095.

It can be divided in two parts, 64 and 5832, that multiplied together give a cube (373248 = 72³).

The spelling of 645832 in words is "six hundred forty-five thousand, eight hundred thirty-two".