645894 has 28 divisors (see below), whose sum is σ = 1455876. Its totient is φ = 214812.

The previous prime is 645893. The next prime is 645901. The reversal of 645894 is 498546.

645894 is a `hidden beast` number, since 645 + 8 + 9 + 4 = 666.

645894 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 645894.

It is not an unprimeable number, because it can be changed into a prime (645893) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 1237 + ... + 1679.

2⁶⁴⁵⁸⁹⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645894, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (727938).

645894 is an abundant number, since it is smaller than the sum of its proper divisors (809982).

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

645894 is an equidigital number, since it uses as much as digits as its factorization.

645894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463 (or 448 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 645894 is about 803.6753075714. The cubic root of 645894 is about 86.4411262542.

The spelling of 645894 in words is "six hundred forty-five thousand, eight hundred ninety-four".