1646379648 has 128 divisors (see below), whose sum is σ = 5026968000. Its totient is φ = 529837056.

The previous prime is 1646379643. The next prime is 1646379649. The reversal of 1646379648 is 8469736461.

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

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 1646379594 and 1646379603.

It is not an unprimeable number, because it can be changed into a prime (1646379643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92011 + ... + 108437.

Almost surely, 2^1646379648 is an apocalyptic number.

1646379648 is a gapful number since it is divisible by the number (18) 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 1646379648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2513484000).

1646379648 is an abundant number, since it is smaller than the sum of its proper divisors (3380588352).

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

1646379648 is a wasteful number, since it uses less digits than its factorization.

1646379648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16479 (or 16461 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The square root of 1646379648 is about 40575.6040990150. The cubic root of 1646379648 is about 1180.8008658861.

The spelling of 1646379648 in words is "one billion, six hundred forty-six million, three hundred seventy-nine thousand, six hundred forty-eight".