68278877 has 2 divisors, whose sum is σ = 68278878. Its totient is φ = 68278876.

The previous prime is 68278849. The next prime is 68278879. The reversal of 68278877 is 77887286.

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., 66031876 + 2247001 = 8126^2 + 1499^2 .

It is a cyclic number.

It is not a de Polignac number, because 68278877 - 2⁶ = 68278813 is a prime.

It is a super-2 number, since 2×68278877² = 9324010088762258, which contains 22 as substring.

Together with 68278879, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68278879) 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, 34139438 + 34139439.

It is an arithmetic number, because the mean of its divisors is an integer number (34139439).

Almost surely, 2^68278877 is an apocalyptic number.

It is an amenable number.

68278877 is a deficient number, since it is larger than the sum of its proper divisors (1).

68278877 is an equidigital number, since it uses as much as digits as its factorization.

68278877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2107392, while the sum is 53.

The square root of 68278877 is about 8263.1033516470. The cubic root of 68278877 is about 408.7227294010.

The spelling of 68278877 in words is "sixty-eight million, two hundred seventy-eight thousand, eight hundred seventy-seven".