645313442 has 16 divisors (see below), whose sum is σ = 978955200. Its totient is φ = 319004400.

The previous prime is 645313441. The next prime is 645313451. The reversal of 645313442 is 244313546.

It is a junction number, because it is equal to n+sod(n) for n = 645313399 and 645313408.

It is not an unprimeable number, because it can be changed into a prime (645313441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171659 + ... + 175377.

It is an arithmetic number, because the mean of its divisors is an integer number (61184700).

Almost surely, 2^645313442 is an apocalyptic number.

645313442 is a deficient number, since it is larger than the sum of its proper divisors (333641758).

645313442 is a wasteful number, since it uses less digits than its factorization.

645313442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4681.

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

The square root of 645313442 is about 25403.0203322361. The cubic root of 645313442 is about 864.1521945898.

Adding to 645313442 its reverse (244313546), we get a palindrome (889626988).

The spelling of 645313442 in words is "six hundred forty-five million, three hundred thirteen thousand, four hundred forty-two".