645441822 has 24 divisors (see below), whose sum is σ = 1480720176. Its totient is φ = 202491456.

The previous prime is 645441821. The next prime is 645441827. The reversal of 645441822 is 228144546.

645441822 is a `hidden beast` number, since 645 + 4 + 4 + 1 + 8 + 2 + 2 = 666.

645441822 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645441821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1054338 + ... + 1054949.

It is an arithmetic number, because the mean of its divisors is an integer number (61696674).

Almost surely, 2^645441822 is an apocalyptic number.

645441822 is an abundant number, since it is smaller than the sum of its proper divisors (835278354).

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

645441822 is a wasteful number, since it uses less digits than its factorization.

645441822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2109312 (or 2109309 counting only the distinct ones).

The product of its digits is 61440, while the sum is 36.

The square root of 645441822 is about 25405.5470714567. The cubic root of 645441822 is about 864.2094962024.

It can be divided in two parts, 64544 and 1822, that added together give a palindrome (66366).

The spelling of 645441822 in words is "six hundred forty-five million, four hundred forty-one thousand, eight hundred twenty-two".