645432 has 16 divisors (see below), whose sum is σ = 1613640. Its totient is φ = 215136.

The previous prime is 645431. The next prime is 645433. The reversal of 645432 is 234546.

645432 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (645431) and next prime (645433).

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 26893 = 645432 / (6 + 4 + 5 + 4 + 3 + 2).

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 645432.

It is not an unprimeable number, because it can be changed into a prime (645431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13423 + ... + 13470.

2⁶⁴⁵⁴³² is an apocalyptic number.

It is an amenable number.

645432 is an abundant number, since it is smaller than the sum of its proper divisors (968208).

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

645432 is a wasteful number, since it uses less digits than its factorization.

645432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26902 (or 26898 counting only the distinct ones).

The product of its digits is 2880, while the sum is 24.

The square root of 645432 is about 803.3878266441. The cubic root of 645432 is about 86.4205112482.

Adding to 645432 its reverse (234546), we get a palindrome (879978).

The spelling of 645432 in words is "six hundred forty-five thousand, four hundred thirty-two".