1267800005 has 8 divisors (see below), whose sum is σ = 1562478072. Its totient is φ = 986827968.

The previous prime is 1267799999. The next prime is 1267800011. The reversal of 1267800005 is 5000087621.

It is an interprime number because it is at equal distance from previous prime (1267799999) and next prime (1267800011).

It can be written as a sum of positive squares in 4 ways, for example, as 122722084 + 1145077921 = 11078^2 + 33839^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1267800005 - 2²⁰ = 1266751429 is a prime.

It is a Duffinian number.

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, 3426302 + ... + 3426671.

It is an arithmetic number, because the mean of its divisors is an integer number (195309759).

Almost surely, 2^1267800005 is an apocalyptic number.

It is an amenable number.

1267800005 is a deficient number, since it is larger than the sum of its proper divisors (294678067).

1267800005 is an equidigital number, since it uses as much as digits as its factorization.

1267800005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6853015.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 1267800005 is about 35606.1793092154. The cubic root of 1267800005 is about 1082.3064576902.

Adding to 1267800005 its reverse (5000087621), we get a palindrome (6267887626).

The spelling of 1267800005 in words is "one billion, two hundred sixty-seven million, eight hundred thousand, five".