644172034 has 8 divisors (see below), whose sum is σ = 1054099728. Its totient is φ = 292805460.

The previous prime is 644172019. The next prime is 644172037. The reversal of 644172034 is 430271446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 644171987 and 644172005.

It is not an unprimeable number, because it can be changed into a prime (644172037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14640252 + ... + 14640295.

It is an arithmetic number, because the mean of its divisors is an integer number (131762466).

Almost surely, 2^644172034 is an apocalyptic number.

644172034 is a deficient number, since it is larger than the sum of its proper divisors (409927694).

644172034 is a wasteful number, since it uses less digits than its factorization.

644172034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29280560.

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 644172034 is about 25380.5443992047. The cubic root of 644172034 is about 863.6423997745.

The spelling of 644172034 in words is "six hundred forty-four million, one hundred seventy-two thousand, thirty-four".