1276630645 has 4 divisors (see below), whose sum is σ = 1531956780. Its totient is φ = 1021304512.

The previous prime is 1276630637. The next prime is 1276630651. The reversal of 1276630645 is 5460366721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 551028676 + 725601969 = 23474^2 + 26937^2 .

It is a cyclic number.

It is not a de Polignac number, because 1276630645 - 2³ = 1276630637 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1276630598 and 1276630607.

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 3 ways as a sum of consecutive naturals, for example, 127663060 + ... + 127663069.

It is an arithmetic number, because the mean of its divisors is an integer number (382989195).

Almost surely, 2^1276630645 is an apocalyptic number.

It is an amenable number.

1276630645 is a deficient number, since it is larger than the sum of its proper divisors (255326135).

1276630645 is an equidigital number, since it uses as much as digits as its factorization.

1276630645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255326134.

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 1276630645 is about 35729.9684438708. The cubic root of 1276630645 is about 1084.8135181783.

The spelling of 1276630645 in words is "one billion, two hundred seventy-six million, six hundred thirty thousand, six hundred forty-five".