1678888769 has 2 divisors, whose sum is σ = 1678888770. Its totient is φ = 1678888768.

The previous prime is 1678888759. The next prime is 1678888781. The reversal of 1678888769 is 9678888761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 875449744 + 803439025 = 29588^2 + 28345^2 .

It is a cyclic number.

It is not a de Polignac number, because 1678888769 - 2²⁴ = 1662111553 is a prime.

It is a super-2 number, since 2×1678888769² = 5637334997348670722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1678888699 and 1678888708.

It is not a weakly prime, because it can be changed into another prime (1678888759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 839444384 + 839444385.

It is an arithmetic number, because the mean of its divisors is an integer number (839444385).

Almost surely, 2^1678888769 is an apocalyptic number.

It is an amenable number.

1678888769 is a deficient number, since it is larger than the sum of its proper divisors (1).

1678888769 is an equidigital number, since it uses as much as digits as its factorization.

1678888769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 65028096, while the sum is 68.

The square root of 1678888769 is about 40974.2451913394. The cubic root of 1678888769 is about 1188.5222267759.

The spelling of 1678888769 in words is "one billion, six hundred seventy-eight million, eight hundred eighty-eight thousand, seven hundred sixty-nine".