645236 has 6 divisors (see below), whose sum is σ = 1129170. Its totient is φ = 322616.

The previous prime is 645233. The next prime is 645257. The reversal of 645236 is 632546.

645236 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 490000 + 155236 = 700^2 + 394^2 .

It is an Ulam number.

It is a congruent number.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80651 + ... + 80658.

It is an arithmetic number, because the mean of its divisors is an integer number (188195).

2⁶⁴⁵²³⁶ is an apocalyptic number.

It is an amenable number.

645236 is a deficient number, since it is larger than the sum of its proper divisors (483934).

645236 is a wasteful number, since it uses less digits than its factorization.

645236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161313 (or 161311 counting only the distinct ones).

The product of its digits is 4320, while the sum is 26.

The square root of 645236 is about 803.2658339554. The cubic root of 645236 is about 86.4117625161.

The spelling of 645236 in words is "six hundred forty-five thousand, two hundred thirty-six".