68077777 has 2 divisors, whose sum is σ = 68077778. Its totient is φ = 68077776.

The previous prime is 68077759. The next prime is 68077837. The reversal of 68077777 is 77777086.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47320641 + 20757136 = 6879^2 + 4556^2 .

It is a cyclic number.

It is not a de Polignac number, because 68077777 - 2¹⁵ = 68045009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68077777.

It is not a weakly prime, because it can be changed into another prime (68077727) 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, 34038888 + 34038889.

It is an arithmetic number, because the mean of its divisors is an integer number (34038889).

Almost surely, 2^68077777 is an apocalyptic number.

It is an amenable number.

68077777 is a deficient number, since it is larger than the sum of its proper divisors (1).

68077777 is an equidigital number, since it uses as much as digits as its factorization.

68077777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 806736, while the sum is 49.

The square root of 68077777 is about 8250.9258268391. The cubic root of 68077777 is about 408.3210680012.

The spelling of 68077777 in words is "sixty-eight million, seventy-seven thousand, seven hundred seventy-seven".