677678849 has 2 divisors, whose sum is σ = 677678850. Its totient is φ = 677678848.

The previous prime is 677678809. The next prime is 677678867. The reversal of 677678849 is 948876776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 675220225 + 2458624 = 25985^2 + 1568^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-677678849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 677678791 and 677678800.

It is not a weakly prime, because it can be changed into another prime (677678809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 338839424 + 338839425.

It is an arithmetic number, because the mean of its divisors is an integer number (338839425).

Almost surely, 2^677678849 is an apocalyptic number.

It is an amenable number.

677678849 is a deficient number, since it is larger than the sum of its proper divisors (1).

677678849 is an equidigital number, since it uses as much as digits as its factorization.

677678849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28449792, while the sum is 62.

The square root of 677678849 is about 26032.2655372136. The cubic root of 677678849 is about 878.3642344406.

The spelling of 677678849 in words is "six hundred seventy-seven million, six hundred seventy-eight thousand, eight hundred forty-nine".