645560430 has 64 divisors (see below), whose sum is σ = 1603196928. Its totient is φ = 166193280.

The previous prime is 645560401. The next prime is 645560441. The reversal of 645560430 is 34065546.

It is a junction number, because it is equal to n+sod(n) for n = 645560391 and 645560400.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 681217 + ... + 682163.

It is an arithmetic number, because the mean of its divisors is an integer number (25049952).

Almost surely, 2^645560430 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645560430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (801598464).

645560430 is an abundant number, since it is smaller than the sum of its proper divisors (957636498).

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

645560430 is a wasteful number, since it uses less digits than its factorization.

645560430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1721.

The product of its (nonzero) digits is 43200, while the sum is 33.

The square root of 645560430 is about 25407.8812575941. The cubic root of 645560430 is about 864.2624293914.

The spelling of 645560430 in words is "six hundred forty-five million, five hundred sixty thousand, four hundred thirty".