648381944 has 32 divisors (see below), whose sum is σ = 1390327680. Its totient is φ = 277690464.

The previous prime is 648381941. The next prime is 648381947. The reversal of 648381944 is 449183846.

648381944 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (648381941) and next prime (648381947).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648381941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108359 + ... + 114185.

It is an arithmetic number, because the mean of its divisors is an integer number (43447740).

Almost surely, 2^648381944 is an apocalyptic number.

It is an amenable number.

648381944 is an abundant number, since it is smaller than the sum of its proper divisors (741945736).

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

648381944 is a wasteful number, since it uses less digits than its factorization.

648381944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7827 (or 7823 counting only the distinct ones).

The product of its digits is 663552, while the sum is 47.

The square root of 648381944 is about 25463.3451062503. The cubic root of 648381944 is about 865.5197268685.

The spelling of 648381944 in words is "six hundred forty-eight million, three hundred eighty-one thousand, nine hundred forty-four".