1378678511 has 8 divisors (see below), whose sum is σ = 1597217184. Its totient is φ = 1165536000.

The previous prime is 1378678481. The next prime is 1378678517. The reversal of 1378678511 is 1158768731.

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 1378678511 - 2⁶ = 1378678447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378678517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1348490 + ... + 1349511.

It is an arithmetic number, because the mean of its divisors is an integer number (199652148).

Almost surely, 2^1378678511 is an apocalyptic number.

1378678511 is a deficient number, since it is larger than the sum of its proper divisors (218538673).

1378678511 is an equidigital number, since it uses as much as digits as its factorization.

1378678511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2698081.

The product of its digits is 282240, while the sum is 47.

The square root of 1378678511 is about 37130.5603378134. The cubic root of 1378678511 is about 1112.9807908141.

The spelling of 1378678511 in words is "one billion, three hundred seventy-eight million, six hundred seventy-eight thousand, five hundred eleven".