645392 has 40 divisors (see below), whose sum is σ = 1443360. Its totient is φ = 276480.

The previous prime is 645383. The next prime is 645397. The reversal of 645392 is 293546.

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 645392.

It is not an unprimeable number, because it can be changed into a prime (645397) by changing a digit.

645392 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 7 ways as a sum of consecutive naturals, for example, 3248 + ... + 3440.

It is an arithmetic number, because the mean of its divisors is an integer number (36084).

2⁶⁴⁵³⁹² 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 645392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (721680).

645392 is an abundant number, since it is smaller than the sum of its proper divisors (797968).

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

645392 is a wasteful number, since it uses less digits than its factorization.

645392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231 (or 225 counting only the distinct ones).

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

The square root of 645392 is about 803.3629316816. The cubic root of 645392 is about 86.4187259366.

The spelling of 645392 in words is "six hundred forty-five thousand, three hundred ninety-two".