1648640 has 96 divisors (see below), whose sum is σ = 4717440. Its totient is φ = 540672.

The previous prime is 1648613. The next prime is 1648697. The reversal of 1648640 is 468461.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71669 + ... + 71691.

It is an arithmetic number, because the mean of its divisors is an integer number (49140).

2^1648640 is an apocalyptic number.

1648640 is a gapful number since it is divisible by the number (10) 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 1648640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2358720).

1648640 is an abundant number, since it is smaller than the sum of its proper divisors (3068800).

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

1648640 is an equidigital number, since it uses as much as digits as its factorization.

1648640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57 (or 37 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 1648640 is about 1283.9937694553. The cubic root of 1648640 is about 118.1341001546.

The spelling of 1648640 in words is "one million, six hundred forty-eight thousand, six hundred forty".