648244440 has 192 divisors, whose sum is σ = 2218376160. Its totient is φ = 163952640.

The previous prime is 648244427. The next prime is 648244463. The reversal of 648244440 is 44442846.

648244440 is a `hidden beast` number, since 648 + 2 + 4 + 4 + 4 + 4 + 0 = 666.

648244440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 648244395 and 648244404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 545527 + ... + 546713.

Almost surely, 2^648244440 is an apocalyptic number.

648244440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 648244440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1109188080).

648244440 is an abundant number, since it is smaller than the sum of its proper divisors (1570131720).

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

648244440 is a wasteful number, since it uses less digits than its factorization.

648244440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282 (or 1275 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 36.

The square root of 648244440 is about 25460.6449250603. The cubic root of 648244440 is about 865.4585382231.

The spelling of 648244440 in words is "six hundred forty-eight million, two hundred forty-four thousand, four hundred forty".