645235 has 8 divisors (see below), whose sum is σ = 819936. Its totient is φ = 485760.

The previous prime is 645233. The next prime is 645257. The reversal of 645235 is 532546.

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

It is not a de Polignac number, because 645235 - 2¹ = 645233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3711 + ... + 3880.

It is an arithmetic number, because the mean of its divisors is an integer number (102492).

2⁶⁴⁵²³⁵ is an apocalyptic number.

645235 is a deficient number, since it is larger than the sum of its proper divisors (174701).

645235 is a wasteful number, since it uses less digits than its factorization.

645235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7613.

The product of its digits is 3600, while the sum is 25.

The square root of 645235 is about 803.2652114962. The cubic root of 645235 is about 86.4117178752.

The spelling of 645235 in words is "six hundred forty-five thousand, two hundred thirty-five".