645422224 has 10 divisors (see below), whose sum is σ = 1250505590. Its totient is φ = 322711104.

The previous prime is 645422209. The next prime is 645422227. The reversal of 645422224 is 422224546.

It can be written as a sum of positive squares in only one way, i.e., 576000000 + 69422224 = 24000^2 + 8332^2 .

It is not an unprimeable number, because it can be changed into a prime (645422227) 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 as a sum of consecutive naturals, namely, 20169429 + ... + 20169460.

It is an arithmetic number, because the mean of its divisors is an integer number (125050559).

Almost surely, 2^645422224 is an apocalyptic number.

It is an amenable number.

645422224 is a deficient number, since it is larger than the sum of its proper divisors (605083366).

645422224 is a wasteful number, since it uses less digits than its factorization.

645422224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40338897 (or 40338891 counting only the distinct ones).

The product of its digits is 30720, while the sum is 31.

The square root of 645422224 is about 25405.1613653604. The cubic root of 645422224 is about 864.2007492488.

It can be divided in two parts, 64542 and 2224, that added together give a palindrome (66766).

The spelling of 645422224 in words is "six hundred forty-five million, four hundred twenty-two thousand, two hundred twenty-four".