644325692 has 6 divisors (see below), whose sum is σ = 1127569968. Its totient is φ = 322162844.

The previous prime is 644325677. The next prime is 644325697. The reversal of 644325692 is 296523446.

644325692 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 not an unprimeable number, because it can be changed into a prime (644325697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80540708 + ... + 80540715.

It is an arithmetic number, because the mean of its divisors is an integer number (187928328).

Almost surely, 2^644325692 is an apocalyptic number.

It is an amenable number.

644325692 is a deficient number, since it is larger than the sum of its proper divisors (483244276).

644325692 is a wasteful number, since it uses less digits than its factorization.

644325692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161081427 (or 161081425 counting only the distinct ones).

The product of its digits is 311040, while the sum is 41.

The square root of 644325692 is about 25383.5713011389. The cubic root of 644325692 is about 863.7110641512.

The spelling of 644325692 in words is "six hundred forty-four million, three hundred twenty-five thousand, six hundred ninety-two".