644600034 has 24 divisors (see below), whose sum is σ = 1504067292. Its totient is φ = 198338400.

The previous prime is 644599987. The next prime is 644600053. The reversal of 644600034 is 430006446.

It is a happy number.

644600034 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 2 ways, for example, as 638825625 + 5774409 = 25275^2 + 2403^2 .

It is a junction number, because it is equal to n+sod(n) for n = 644599980 and 644600007.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1377117 + ... + 1377584.

Almost surely, 2^644600034 is an apocalyptic number.

644600034 is an abundant number, since it is smaller than the sum of its proper divisors (859467258).

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

644600034 is a wasteful number, since it uses less digits than its factorization.

644600034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2754722 (or 2754719 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 644600034 is about 25388.9746543652. The cubic root of 644600034 is about 863.8336308395.

The spelling of 644600034 in words is "six hundred forty-four million, six hundred thousand, thirty-four".