1299895680 has 64 divisors (see below), whose sum is σ = 4143423600. Its totient is φ = 346638336.

The previous prime is 1299895679. The next prime is 1299895733. The reversal of 1299895680 is 865989921.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 1299895680.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 336595 + ... + 340434.

Almost surely, 2^1299895680 is an apocalyptic number.

1299895680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1299895680 is an abundant number, since it is smaller than the sum of its proper divisors (2843527920).

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

1299895680 is an equidigital number, since it uses as much as digits as its factorization.

1299895680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677051 (or 677039 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 57.

The square root of 1299895680 is about 36054.0660675048. The cubic root of 1299895680 is about 1091.3636889198.

The spelling of 1299895680 in words is "one billion, two hundred ninety-nine million, eight hundred ninety-five thousand, six hundred eighty".