1660648 has 32 divisors (see below), whose sum is σ = 3447360. Its totient is φ = 743680.

The previous prime is 1660609. The next prime is 1660661. The reversal of 1660648 is 8460661.

It is a super-3 number, since 3×1660648³ = 13738964933382053376, which contains 333 as substring.

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 7 ways as a sum of consecutive naturals, for example, 9861 + ... + 10027.

It is an arithmetic number, because the mean of its divisors is an integer number (107730).

2^1660648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1660648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1723680).

1660648 is an abundant number, since it is smaller than the sum of its proper divisors (1786712).

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

1660648 is a wasteful number, since it uses less digits than its factorization.

1660648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297 (or 293 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 1660648 is about 1288.6613209063. The cubic root of 1660648 is about 118.4202196415.

The spelling of 1660648 in words is "one million, six hundred sixty thousand, six hundred forty-eight".