1297289680 has 20 divisors (see below), whose sum is σ = 3016198692. Its totient is φ = 518915840.

The previous prime is 1297289663. The next prime is 1297289701. The reversal of 1297289680 is 869827921.

It can be written as a sum of positive squares in 2 ways, for example, as 334304656 + 962985024 = 18284^2 + 31032^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8107981 + ... + 8108140.

Almost surely, 2^1297289680 is an apocalyptic number.

1297289680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1297289680 is an abundant number, since it is smaller than the sum of its proper divisors (1718909012).

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

1297289680 is a wasteful number, since it uses less digits than its factorization.

1297289680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16216134 (or 16216128 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 1297289680 is about 36017.9077682200. The cubic root of 1297289680 is about 1090.6338876680.

The spelling of 1297289680 in words is "one billion, two hundred ninety-seven million, two hundred eighty-nine thousand, six hundred eighty".