68778587 has 2 divisors, whose sum is σ = 68778588. Its totient is φ = 68778586.

The previous prime is 68778557. The next prime is 68778599. The reversal of 68778587 is 78587786.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68778587 - 2⁸ = 68778331 is a prime.

It is not a weakly prime, because it can be changed into another prime (68778557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34389293 + 34389294.

It is an arithmetic number, because the mean of its divisors is an integer number (34389294).

Almost surely, 2^68778587 is an apocalyptic number.

68778587 is a deficient number, since it is larger than the sum of its proper divisors (1).

68778587 is an equidigital number, since it uses as much as digits as its factorization.

68778587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5268480, while the sum is 56.

The square root of 68778587 is about 8293.2856576872. The cubic root of 68778587 is about 409.7174078859.

The spelling of 68778587 in words is "sixty-eight million, seven hundred seventy-eight thousand, five hundred eighty-seven".