1648663680 has 128 divisors (see below), whose sum is σ = 5274118080. Its totient is φ = 438054912.

The previous prime is 1648663673. The next prime is 1648663699. The reversal of 1648663680 is 863668461.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×1648663680² = 5436183859502284800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 588042 + ... + 590838.

Almost surely, 2^1648663680 is an apocalyptic number.

1648663680 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 1648663680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2637059040).

1648663680 is an abundant number, since it is smaller than the sum of its proper divisors (3625454400).

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

1648663680 is a wasteful number, since it uses less digits than its factorization.

1648663680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3126 (or 3114 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 48.

The square root of 1648663680 is about 40603.7397292417. The cubic root of 1648663680 is about 1181.3466575255.

The spelling of 1648663680 in words is "one billion, six hundred forty-eight million, six hundred sixty-three thousand, six hundred eighty".