645104226 has 64 divisors (see below), whose sum is σ = 1470228480. Its totient is φ = 187064640.

The previous prime is 645104197. The next prime is 645104227. The reversal of 645104226 is 622401546.

It is a junction number, because it is equal to n+sod(n) for n = 645104193 and 645104202.

It is not an unprimeable number, because it can be changed into a prime (645104227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 311671 + ... + 313733.

It is an arithmetic number, because the mean of its divisors is an integer number (22972320).

Almost surely, 2^645104226 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645104226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (735114240).

645104226 is an abundant number, since it is smaller than the sum of its proper divisors (825124254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645104226 is a wasteful number, since it uses less digits than its factorization.

645104226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2311.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 645104226 is about 25398.9020628845. The cubic root of 645104226 is about 864.0587960459.

The spelling of 645104226 in words is "six hundred forty-five million, one hundred four thousand, two hundred twenty-six".