645358244 has 6 divisors (see below), whose sum is σ = 1129376934. Its totient is φ = 322679120.

The previous prime is 645358243. The next prime is 645358253. The reversal of 645358244 is 442853546.

645358244 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 643636900 + 1721344 = 25370^2 + 1312^2 .

It is not an unprimeable number, because it can be changed into a prime (645358243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80669777 + ... + 80669784.

It is an arithmetic number, because the mean of its divisors is an integer number (188229489).

Almost surely, 2^645358244 is an apocalyptic number.

It is an amenable number.

645358244 is a deficient number, since it is larger than the sum of its proper divisors (484018690).

645358244 is a wasteful number, since it uses less digits than its factorization.

645358244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161339565 (or 161339563 counting only the distinct ones).

The product of its digits is 460800, while the sum is 41.

The square root of 645358244 is about 25403.9021412066. The cubic root of 645358244 is about 864.1721925464.

The spelling of 645358244 in words is "six hundred forty-five million, three hundred fifty-eight thousand, two hundred forty-four".