68778331 has 2 divisors, whose sum is σ = 68778332. Its totient is φ = 68778330.

The previous prime is 68778319. The next prime is 68778377. The reversal of 68778331 is 13387786.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68778331 - 2⁵ = 68778299 is a prime.

It is a super-2 number, since 2×68778331² = 9460917630291122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68478331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34389165 + 34389166.

It is an arithmetic number, because the mean of its divisors is an integer number (34389166).

Almost surely, 2^68778331 is an apocalyptic number.

68778331 is a deficient number, since it is larger than the sum of its proper divisors (1).

68778331 is an equidigital number, since it uses as much as digits as its factorization.

68778331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 43.

The square root of 68778331 is about 8293.2702235005. The cubic root of 68778331 is about 409.7168995504.

The spelling of 68778331 in words is "sixty-eight million, seven hundred seventy-eight thousand, three hundred thirty-one".