645376226 has 32 divisors (see below), whose sum is σ = 1075700736. Its totient is φ = 287938000.

The previous prime is 645376213. The next prime is 645376261. The reversal of 645376226 is 622673546.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 410021 + ... + 411591.

It is an arithmetic number, because the mean of its divisors is an integer number (33615648).

Almost surely, 2^645376226 is an apocalyptic number.

645376226 is a deficient number, since it is larger than the sum of its proper divisors (430324510).

645376226 is a wasteful number, since it uses less digits than its factorization.

645376226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1918.

The product of its digits is 362880, while the sum is 41.

The square root of 645376226 is about 25404.2560607470. The cubic root of 645376226 is about 864.1802187862.

The spelling of 645376226 in words is "six hundred forty-five million, three hundred seventy-six thousand, two hundred twenty-six".