648319968 has 36 divisors (see below), whose sum is σ = 1843660728. Its totient is φ = 216106560.

The previous prime is 648319963. The next prime is 648319981. The reversal of 648319968 is 869913846.

It is a tau number, because it is divible by the number of its divisors (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648319961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1125268 + ... + 1125843.

It is an arithmetic number, because the mean of its divisors is an integer number (51212798).

Almost surely, 2^648319968 is an apocalyptic number.

It is an amenable number.

648319968 is an abundant number, since it is smaller than the sum of its proper divisors (1195340760).

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

648319968 is a wasteful number, since it uses less digits than its factorization.

648319968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2251127 (or 2251116 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The square root of 648319968 is about 25462.1281121590. The cubic root of 648319968 is about 865.4921489055.

The spelling of 648319968 in words is "six hundred forty-eight million, three hundred nineteen thousand, nine hundred sixty-eight".