645835 has 8 divisors (see below), whose sum is σ = 796176. Its totient is φ = 502560.

The previous prime is 645833. The next prime is 645839. The reversal of 645835 is 538546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 645835 - 2¹ = 645833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645797 and 645806.

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, 1561 + ... + 1930.

It is an arithmetic number, because the mean of its divisors is an integer number (99522).

2⁶⁴⁵⁸³⁵ is an apocalyptic number.

645835 is a deficient number, since it is larger than the sum of its proper divisors (150341).

645835 is a wasteful number, since it uses less digits than its factorization.

645835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3533.

The product of its digits is 14400, while the sum is 31.

The square root of 645835 is about 803.6386003671. The cubic root of 645835 is about 86.4384941496.

The spelling of 645835 in words is "six hundred forty-five thousand, eight hundred thirty-five".