645485000 has 40 divisors (see below), whose sum is σ = 1512383070. Its totient is φ = 258192000.

The previous prime is 645484991. The next prime is 645485033. The reversal of 645485000 is 584546.

It can be written as a sum of positive squares in 5 ways, for example, as 20164 + 645464836 = 142^2 + 25406^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 59549 + ... + 69548.

Almost surely, 2^645485000 is an apocalyptic number.

It is an amenable number.

645485000 is an abundant number, since it is smaller than the sum of its proper divisors (866898070).

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

645485000 is a wasteful number, since it uses less digits than its factorization.

645485000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129123 (or 129104 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 645485000 is about 25406.3968322940. The cubic root of 645485000 is about 864.2287667260.

The spelling of 645485000 in words is "six hundred forty-five million, four hundred eighty-five thousand".