644352234 has 16 divisors (see below), whose sum is σ = 1316124288. Its totient is φ = 210214112.

The previous prime is 644352223. The next prime is 644352251. The reversal of 644352234 is 432253446.

It is a junction number, because it is equal to n+sod(n) for n = 644352195 and 644352204.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1142187 + ... + 1142750.

It is an arithmetic number, because the mean of its divisors is an integer number (82257768).

Almost surely, 2^644352234 is an apocalyptic number.

644352234 is an abundant number, since it is smaller than the sum of its proper divisors (671772054).

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

644352234 is a wasteful number, since it uses less digits than its factorization.

644352234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2284989.

The product of its digits is 69120, while the sum is 33.

The square root of 644352234 is about 25384.0941142283. The cubic root of 644352234 is about 863.7229237353.

The spelling of 644352234 in words is "six hundred forty-four million, three hundred fifty-two thousand, two hundred thirty-four".