645345226 has 8 divisors (see below), whose sum is σ = 972173124. Its totient is φ = 321287520.

The previous prime is 645345193. The next prime is 645345251. The reversal of 645345226 is 622543546.

It can be written as a sum of positive squares in 2 ways, for example, as 568870201 + 76475025 = 23851^2 + 8745^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 691965 + ... + 692896.

Almost surely, 2^645345226 is an apocalyptic number.

645345226 is a deficient number, since it is larger than the sum of its proper divisors (326827898).

645345226 is a wasteful number, since it uses less digits than its factorization.

645345226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1385096.

The product of its digits is 172800, while the sum is 37.

The square root of 645345226 is about 25403.6459194345. The cubic root of 645345226 is about 864.1663818878.

The spelling of 645345226 in words is "six hundred forty-five million, three hundred forty-five thousand, two hundred twenty-six".