1306634678 has 4 divisors (see below), whose sum is σ = 1959952020. Its totient is φ = 653317338.

The previous prime is 1306634663. The next prime is 1306634683. The reversal of 1306634678 is 8764366031.

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

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 as a sum of consecutive naturals, namely, 326658668 + ... + 326658671.

It is an arithmetic number, because the mean of its divisors is an integer number (489988005).

Almost surely, 2^1306634678 is an apocalyptic number.

1306634678 is a deficient number, since it is larger than the sum of its proper divisors (653317342).

1306634678 is an equidigital number, since it uses as much as digits as its factorization.

1306634678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653317341.

The product of its (nonzero) digits is 435456, while the sum is 44.

The square root of 1306634678 is about 36147.4020919900. The cubic root of 1306634678 is about 1093.2464104214.

The spelling of 1306634678 in words is "one billion, three hundred six million, six hundred thirty-four thousand, six hundred seventy-eight".