1681648572 has 24 divisors (see below), whose sum is σ = 3953803392. Its totient is φ = 556270000.

The previous prime is 1681648571. The next prime is 1681648597. The reversal of 1681648572 is 2758461861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681648571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 533304 + ... + 536447.

It is an arithmetic number, because the mean of its divisors is an integer number (164741808).

Almost surely, 2^1681648572 is an apocalyptic number.

1681648572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1681648572 is an abundant number, since it is smaller than the sum of its proper divisors (2272154820).

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

1681648572 is a wasteful number, since it uses less digits than its factorization.

1681648572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069889 (or 1069887 counting only the distinct ones).

The product of its digits is 645120, while the sum is 48.

The square root of 1681648572 is about 41007.9086518686. The cubic root of 1681648572 is about 1189.1731119742.

The spelling of 1681648572 in words is "one billion, six hundred eighty-one million, six hundred forty-eight thousand, five hundred seventy-two".