645310245 has 48 divisors (see below), whose sum is σ = 1079464320. Its totient is φ = 329067648.

The previous prime is 645310219. The next prime is 645310247. The reversal of 645310245 is 542013546.

It is not a de Polignac number, because 645310245 - 2⁶ = 645310181 is a prime.

645310245 is a modest number, since divided by 310245 gives 645 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645310247) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1469736 + ... + 1470174.

It is an arithmetic number, because the mean of its divisors is an integer number (22488840).

Almost surely, 2^645310245 is an apocalyptic number.

It is an amenable number.

645310245 is a deficient number, since it is larger than the sum of its proper divisors (434154075).

645310245 is a wasteful number, since it uses less digits than its factorization.

645310245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586 (or 543 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 645310245 is about 25402.9574065698. The cubic root of 645310245 is about 864.1507675318.

The spelling of 645310245 in words is "six hundred forty-five million, three hundred ten thousand, two hundred forty-five".