68777909 has 2 divisors, whose sum is σ = 68777910. Its totient is φ = 68777908.

The previous prime is 68777881. The next prime is 68777921. The reversal of 68777909 is 90977786.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63123025 + 5654884 = 7945^2 + 2378^2 .

It is a cyclic number.

It is not a de Polignac number, because 68777909 - 2¹⁶ = 68712373 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68777939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34388954 + 34388955.

It is an arithmetic number, because the mean of its divisors is an integer number (34388955).

Almost surely, 2^68777909 is an apocalyptic number.

It is an amenable number.

68777909 is a deficient number, since it is larger than the sum of its proper divisors (1).

68777909 is an equidigital number, since it uses as much as digits as its factorization.

68777909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1333584, while the sum is 53.

The square root of 68777909 is about 8293.2447811457. The cubic root of 68777909 is about 409.7160615884.

The spelling of 68777909 in words is "sixty-eight million, seven hundred seventy-seven thousand, nine hundred nine".