645535000 has 160 divisors (see below), whose sum is σ = 1680774480. Its totient is φ = 232320000.

The previous prime is 645534977. The next prime is 645535021. The reversal of 645535000 is 535546.

It is a self number, because there is not a number n which added to its sum of digits gives 645535000.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6654952 + ... + 6655048.

Almost surely, 2^645535000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645535000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (840387240).

645535000 is an abundant number, since it is smaller than the sum of its proper divisors (1035239480).

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

645535000 is an equidigital number, since it uses as much as digits as its factorization.

645535000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156 (or 115 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 28.

The square root of 645535000 is about 25407.3808173924. The cubic root of 645535000 is about 864.2510808633.

The spelling of 645535000 in words is "six hundred forty-five million, five hundred thirty-five thousand".