645485500 has 48 divisors (see below), whose sum is σ = 1537911648. Its totient is φ = 234720000.

The previous prime is 645485497. The next prime is 645485507. The reversal of 645485500 is 5584546.

It is a self number, because there is not a number n which added to its sum of digits gives 645485500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645485507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53181 + ... + 64180.

It is an arithmetic number, because the mean of its divisors is an integer number (32039826).

Almost surely, 2^645485500 is an apocalyptic number.

It is an amenable number.

645485500 is an abundant number, since it is smaller than the sum of its proper divisors (892426148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645485500 is a wasteful number, since it uses less digits than its factorization.

645485500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117391 (or 117379 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 37.

The square root of 645485500 is about 25406.4066723337. The cubic root of 645485500 is about 864.2289898731.

The spelling of 645485500 in words is "six hundred forty-five million, four hundred eighty-five thousand, five hundred".