644072348 has 6 divisors (see below), whose sum is σ = 1127126616. Its totient is φ = 322036172.

The previous prime is 644072329. The next prime is 644072383. The reversal of 644072348 is 843270446.

644072348 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80509040 + ... + 80509047.

It is an arithmetic number, because the mean of its divisors is an integer number (187854436).

Almost surely, 2^644072348 is an apocalyptic number.

It is an amenable number.

644072348 is a deficient number, since it is larger than the sum of its proper divisors (483054268).

644072348 is a wasteful number, since it uses less digits than its factorization.

644072348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161018091 (or 161018089 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 38.

The square root of 644072348 is about 25378.5804961586. The cubic root of 644072348 is about 863.5978477537.

The spelling of 644072348 in words is "six hundred forty-four million, seventy-two thousand, three hundred forty-eight".