1641703680 has 288 divisors, whose sum is σ = 5921059200. Its totient is φ = 430645248.

The previous prime is 1641703649. The next prime is 1641703697. The reversal of 1641703680 is 863071461.

1641703680 is a `hidden beast` number, since 1 + 641 + 7 + 0 + 3 + 6 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2315166 + ... + 2315874.

Almost surely, 2^1641703680 is an apocalyptic number.

1641703680 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 1641703680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2960529600).

1641703680 is an abundant number, since it is smaller than the sum of its proper divisors (4279355520).

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

1641703680 is an equidigital number, since it uses as much as digits as its factorization.

1641703680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806 (or 786 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 1641703680 is about 40517.9426920963. The cubic root of 1641703680 is about 1179.6819213531.

The spelling of 1641703680 in words is "one billion, six hundred forty-one million, seven hundred three thousand, six hundred eighty".