645435 has 32 divisors (see below), whose sum is σ = 1313280. Its totient is φ = 294624.

The previous prime is 645433. The next prime is 645443. The reversal of 645435 is 534546.

It is not a de Polignac number, because 645435 - 2¹ = 645433 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 645399 and 645408.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 645435.

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 31 ways as a sum of consecutive naturals, for example, 604 + ... + 1286.

It is an arithmetic number, because the mean of its divisors is an integer number (41040).

2⁶⁴⁵⁴³⁵ is an apocalyptic number.

645435 is an abundant number, since it is smaller than the sum of its proper divisors (667845).

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

645435 is a wasteful number, since it uses less digits than its factorization.

645435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704 (or 698 counting only the distinct ones).

The product of its digits is 7200, while the sum is 27.

The square root of 645435 is about 803.3896937352. The cubic root of 645435 is about 86.4206451436.

Subtracting from 645435 its reverse (534546), we obtain a square (110889 = 333²).

The spelling of 645435 in words is "six hundred forty-five thousand, four hundred thirty-five".