645226 has 4 divisors (see below), whose sum is σ = 967842. Its totient is φ = 322612.

The previous prime is 645187. The next prime is 645233. The reversal of 645226 is 622546.

645226 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 564001 + 81225 = 751^2 + 285^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 645226.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161305 + ... + 161308.

2⁶⁴⁵²²⁶ is an apocalyptic number.

645226 is a deficient number, since it is larger than the sum of its proper divisors (322616).

645226 is a wasteful number, since it uses less digits than its factorization.

645226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322615.

The product of its digits is 2880, while the sum is 25.

The square root of 645226 is about 803.2596093418. The cubic root of 645226 is about 86.4113161047.

The spelling of 645226 in words is "six hundred forty-five thousand, two hundred twenty-six".