645722022 has 16 divisors (see below), whose sum is σ = 1408848192. Its totient is φ = 195673320.

The previous prime is 645722017. The next prime is 645722029. The reversal of 645722022 is 220227546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645722029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4891768 + ... + 4891899.

It is an arithmetic number, because the mean of its divisors is an integer number (88053012).

Almost surely, 2^645722022 is an apocalyptic number.

645722022 is an abundant number, since it is smaller than the sum of its proper divisors (763126170).

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

645722022 is a wasteful number, since it uses less digits than its factorization.

645722022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9783683.

The product of its (nonzero) digits is 13440, while the sum is 30.

The square root of 645722022 is about 25411.0610168092. The cubic root of 645722022 is about 864.3345353410.

Adding to 645722022 its reverse (220227546), we get a palindrome (865949568).

The spelling of 645722022 in words is "six hundred forty-five million, seven hundred twenty-two thousand, twenty-two".