648806444 has 48 divisors (see below), whose sum is σ = 1379941920. Its totient is φ = 262832640.

The previous prime is 648806413. The next prime is 648806453. The reversal of 648806444 is 444608846.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 648806395 and 648806404.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2969 + ... + 36144.

It is an arithmetic number, because the mean of its divisors is an integer number (28748790).

Almost surely, 2^648806444 is an apocalyptic number.

It is an amenable number.

648806444 is an abundant number, since it is smaller than the sum of its proper divisors (731135476).

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

648806444 is a wasteful number, since it uses less digits than its factorization.

648806444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39170 (or 39168 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 44.

The square root of 648806444 is about 25471.6792536338. The cubic root of 648806444 is about 865.7085728483.

It can be divided in two parts, 6488064 and 44, that multiplied together give a square (285474816 = 16896²).

The spelling of 648806444 in words is "six hundred forty-eight million, eight hundred six thousand, four hundred forty-four".