1680724242 has 30 divisors (see below), whose sum is σ = 3767236869. Its totient is φ = 560067480.

The previous prime is 1680724229. The next prime is 1680724247. The reversal of 1680724242 is 2424270861.

1680724242 is a `hidden beast` number, since 168 + 0 + 72 + 424 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1546141041 + 134583201 = 39321^2 + 11601^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=28989.

It is a junction number, because it is equal to n+sod(n) for n = 1680724197 and 1680724206.

It is not an unprimeable number, because it can be changed into a prime (1680724247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 520192 + ... + 523412.

Almost surely, 2^1680724242 is an apocalyptic number.

1680724242 is an abundant number, since it is smaller than the sum of its proper divisors (2086512627).

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

1680724242 is an frugal number, since it uses more digits than its factorization.

1680724242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6456 (or 3226 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The square root of 1680724242 is about 40996.6369596337. The cubic root of 1680724242 is about 1188.9551929126.

The spelling of 1680724242 in words is "one billion, six hundred eighty million, seven hundred twenty-four thousand, two hundred forty-two".