648819344 has 20 divisors (see below), whose sum is σ = 1257529260. Its totient is φ = 324295680.

The previous prime is 648819343. The next prime is 648819359. The reversal of 648819344 is 443918846.

It can be written as a sum of positive squares in 2 ways, for example, as 216678400 + 432140944 = 14720^2 + 20788^2 .

It is a super-2 number, since 2×648819344² = 841933082297180672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (648819343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57704 + ... + 68024.

It is an arithmetic number, because the mean of its divisors is an integer number (62876463).

Almost surely, 2^648819344 is an apocalyptic number.

It is an amenable number.

648819344 is a deficient number, since it is larger than the sum of its proper divisors (608709916).

648819344 is a wasteful number, since it uses less digits than its factorization.

648819344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14258 (or 14252 counting only the distinct ones).

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

The square root of 648819344 is about 25471.9324747849. The cubic root of 648819344 is about 865.7143103410.

The spelling of 648819344 in words is "six hundred forty-eight million, eight hundred nineteen thousand, three hundred forty-four".