1680206530 has 16 divisors (see below), whose sum is σ = 3081436344. Its totient is φ = 659401600.

The previous prime is 1680206513. The next prime is 1680206569. The reversal of 1680206530 is 356020861.

It can be written as a sum of positive squares in 4 ways, for example, as 1607769409 + 72437121 = 40097^2 + 8511^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1680206492 and 1680206501.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1584571 + ... + 1585630.

Almost surely, 2^1680206530 is an apocalyptic number.

1680206530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1680206530 is a deficient number, since it is larger than the sum of its proper divisors (1401229814).

1680206530 is a wasteful number, since it uses less digits than its factorization.

1680206530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3170261.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 1680206530 is about 40990.3223944384. The cubic root of 1680206530 is about 1188.8331027709.

The spelling of 1680206530 in words is "one billion, six hundred eighty million, two hundred six thousand, five hundred thirty".