678858077 has 2 divisors, whose sum is σ = 678858078. Its totient is φ = 678858076.

The previous prime is 678858043. The next prime is 678858097. The reversal of 678858077 is 770858876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 617721316 + 61136761 = 24854^2 + 7819^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678858077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678858097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339429038 + 339429039.

It is an arithmetic number, because the mean of its divisors is an integer number (339429039).

Almost surely, 2^678858077 is an apocalyptic number.

It is an amenable number.

678858077 is a deficient number, since it is larger than the sum of its proper divisors (1).

678858077 is an equidigital number, since it uses as much as digits as its factorization.

678858077 is an evil number, because the sum of its binary digits is even.

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

The square root of 678858077 is about 26054.9050468429. The cubic root of 678858077 is about 878.8734193285.

The spelling of 678858077 in words is "six hundred seventy-eight million, eight hundred fifty-eight thousand, seventy-seven".