645306242 has 32 divisors (see below), whose sum is σ = 1126766592. Its totient is φ = 271471824.

The previous prime is 645306229. The next prime is 645306313. The reversal of 645306242 is 242603546.

645306242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 645306199 and 645306208.

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, 187703 + ... + 191109.

It is an arithmetic number, because the mean of its divisors is an integer number (35211456).

Almost surely, 2^645306242 is an apocalyptic number.

645306242 is a deficient number, since it is larger than the sum of its proper divisors (481460350).

645306242 is a wasteful number, since it uses less digits than its factorization.

645306242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3662.

The product of its (nonzero) digits is 34560, while the sum is 32.

The square root of 645306242 is about 25402.8786164088. The cubic root of 645306242 is about 864.1489806896.

Adding to 645306242 its reverse (242603546), we get a palindrome (887909788).

The spelling of 645306242 in words is "six hundred forty-five million, three hundred six thousand, two hundred forty-two".