1281580668 has 18 divisors (see below), whose sum is σ = 3239551224. Its totient is φ = 427193544.

The previous prime is 1281580621. The next prime is 1281580679. The reversal of 1281580668 is 8660851821.

1281580668 is a `hidden beast` number, since 1 + 2 + 8 + 1 + 580 + 6 + 68 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

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 5 ways as a sum of consecutive naturals, for example, 17799696 + ... + 17799767.

It is an arithmetic number, because the mean of its divisors is an integer number (179975068).

Almost surely, 2^1281580668 is an apocalyptic number.

1281580668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1281580668 is an abundant number, since it is smaller than the sum of its proper divisors (1957970556).

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

1281580668 is a wasteful number, since it uses less digits than its factorization.

1281580668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35599473 (or 35599468 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The square root of 1281580668 is about 35799.1713311915. The cubic root of 1281580668 is about 1086.2137995681.

The spelling of 1281580668 in words is "one billion, two hundred eighty-one million, five hundred eighty thousand, six hundred sixty-eight".