1305211668 has 24 divisors (see below), whose sum is σ = 3067407840. Its totient is φ = 431940000.

The previous prime is 1305211643. The next prime is 1305211681. The reversal of 1305211668 is 8661125031.

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, 389583 + ... + 392918.

It is an arithmetic number, because the mean of its divisors is an integer number (127808660).

Almost surely, 2^1305211668 is an apocalyptic number.

It is an amenable number.

1305211668 is an abundant number, since it is smaller than the sum of its proper divisors (1762196172).

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

1305211668 is a wasteful number, since it uses less digits than its factorization.

1305211668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782647 (or 782645 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 1305211668 is about 36127.7132960280. The cubic root of 1305211668 is about 1092.8493941536.

Adding to 1305211668 its reverse (8661125031), we get a palindrome (9966336699).

The spelling of 1305211668 in words is "one billion, three hundred five million, two hundred eleven thousand, six hundred sixty-eight".