645122622 has 16 divisors (see below), whose sum is σ = 1290532752. Its totient is φ = 214992960.

The previous prime is 645122609. The next prime is 645122627. The reversal of 645122622 is 226221546.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 645122622.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645122627) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 26898 + ... + 44874.

It is an arithmetic number, because the mean of its divisors is an integer number (80658297).

Almost surely, 2^645122622 is an apocalyptic number.

645122622 is an abundant number, since it is smaller than the sum of its proper divisors (645410130).

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

645122622 is a wasteful number, since it uses less digits than its factorization.

645122622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23963.

The product of its digits is 11520, while the sum is 30.

The square root of 645122622 is about 25399.2642019410. The cubic root of 645122622 is about 864.0670092276.

The spelling of 645122622 in words is "six hundred forty-five million, one hundred twenty-two thousand, six hundred twenty-two".