6648390 has 96 divisors (see below), whose sum is σ = 20195136. Its totient is φ = 1486080.

The previous prime is 6648371. The next prime is 6648401. The reversal of 6648390 is 938466.

6648390 is a `hidden beast` number, since 6 + 648 + 3 + 9 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 38344 + ... + 38516.

It is an arithmetic number, because the mean of its divisors is an integer number (210366).

Almost surely, 2^6648390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6648390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10097568).

6648390 is an abundant number, since it is smaller than the sum of its proper divisors (13546746).

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

6648390 is a wasteful number, since it uses less digits than its factorization.

6648390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254 (or 251 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 6648390 is about 2578.4472071384. The cubic root of 6648390 is about 188.0350583480.

The spelling of 6648390 in words is "six million, six hundred forty-eight thousand, three hundred ninety".