1205646680 has 32 divisors (see below), whose sum is σ = 3100235040. Its totient is φ = 413364480.

The previous prime is 1205646677. The next prime is 1205646731. The reversal of 1205646680 is 866465021.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2152661 + ... + 2153220.

It is an arithmetic number, because the mean of its divisors is an integer number (96882345).

Almost surely, 2^1205646680 is an apocalyptic number.

1205646680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1205646680 is an abundant number, since it is smaller than the sum of its proper divisors (1894588360).

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

1205646680 is a wasteful number, since it uses less digits than its factorization.

1205646680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4305899 (or 4305895 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 1205646680 is about 34722.4233025289. The cubic root of 1205646680 is about 1064.3227651578.

The spelling of 1205646680 in words is "one billion, two hundred five million, six hundred forty-six thousand, six hundred eighty".