1296817668 has 48 divisors (see below), whose sum is σ = 3470584320. Its totient is φ = 418327200.

The previous prime is 1296817661. The next prime is 1296817721. The reversal of 1296817668 is 8667186921.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1296817661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 190323 + ... + 197018.

It is an arithmetic number, because the mean of its divisors is an integer number (72303840).

Almost surely, 2^1296817668 is an apocalyptic number.

1296817668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1296817668 is an abundant number, since it is smaller than the sum of its proper divisors (2173766652).

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

1296817668 is a wasteful number, since it uses less digits than its factorization.

1296817668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387385 (or 387377 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 1296817668 is about 36011.3547093136. The cubic root of 1296817668 is about 1090.5015978286.

The spelling of 1296817668 in words is "one billion, two hundred ninety-six million, eight hundred seventeen thousand, six hundred sixty-eight".