645122202 has 16 divisors (see below), whose sum is σ = 1291792320. Its totient is φ = 214782752.

The previous prime is 645122189. The next prime is 645122209. The reversal of 645122202 is 202221546.

It is a happy number.

645122202 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (645122209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59043 + ... + 69110.

It is an arithmetic number, because the mean of its divisors is an integer number (80737020).

Almost surely, 2^645122202 is an apocalyptic number.

645122202 is an abundant number, since it is smaller than the sum of its proper divisors (646670118).

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

645122202 is a wasteful number, since it uses less digits than its factorization.

645122202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128997.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 645122202 is about 25399.2559339836. The cubic root of 645122202 is about 864.0668217137.

Adding to 645122202 its reverse (202221546), we get a palindrome (847343748).

It can be divided in two parts, 645 and 122202, that multiplied together give a triangular number (78820290 = T₁₂₅₅₅).

The spelling of 645122202 in words is "six hundred forty-five million, one hundred twenty-two thousand, two hundred two".