645968582 has 32 divisors (see below), whose sum is σ = 1123766784. Its totient is φ = 272764800.

The previous prime is 645968581. The next prime is 645968599. The reversal of 645968582 is 285869546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645968581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 732782 + ... + 733662.

It is an arithmetic number, because the mean of its divisors is an integer number (35117712).

Almost surely, 2^645968582 is an apocalyptic number.

645968582 is a deficient number, since it is larger than the sum of its proper divisors (477798202).

645968582 is a wasteful number, since it uses less digits than its factorization.

645968582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1604.

The product of its digits is 4147200, while the sum is 53.

The square root of 645968582 is about 25415.9119844242. The cubic root of 645968582 is about 864.4445327275. Note that the first 3 decimals are identical.

The spelling of 645968582 in words is "six hundred forty-five million, nine hundred sixty-eight thousand, five hundred eighty-two".