645005132 has 12 divisors (see below), whose sum is σ = 1129695000. Its totient is φ = 322235136.

The previous prime is 645005131. The next prime is 645005171. The reversal of 645005132 is 231500546.

It is not an unprimeable number, because it can be changed into a prime (645005131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61382 + ... + 71117.

It is an arithmetic number, because the mean of its divisors is an integer number (94141250).

Almost surely, 2^645005132 is an apocalyptic number.

It is an amenable number.

645005132 is a deficient number, since it is larger than the sum of its proper divisors (484689868).

645005132 is a wasteful number, since it uses less digits than its factorization.

645005132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133720 (or 133718 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 645005132 is about 25396.9512343509. The cubic root of 645005132 is about 864.0145512953.

Adding to 645005132 its reverse (231500546), we get a palindrome (876505678).

The spelling of 645005132 in words is "six hundred forty-five million, five thousand, one hundred thirty-two".