678576917 has 2 divisors, whose sum is σ = 678576918. Its totient is φ = 678576916.

The previous prime is 678576869. The next prime is 678576919. The reversal of 678576917 is 719675876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 617721316 + 60855601 = 24854^2 + 7801^2 .

It is a cyclic number.

It is not a de Polignac number, because 678576917 - 2⁶ = 678576853 is a prime.

Together with 678576919, 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 (678576919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339288458 + 339288459.

It is an arithmetic number, because the mean of its divisors is an integer number (339288459).

Almost surely, 2^678576917 is an apocalyptic number.

It is an amenable number.

678576917 is a deficient number, since it is larger than the sum of its proper divisors (1).

678576917 is an equidigital number, since it uses as much as digits as its factorization.

678576917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4445280, while the sum is 56.

The square root of 678576917 is about 26049.5089589036. The cubic root of 678576917 is about 878.7520693828.

The spelling of 678576917 in words is "six hundred seventy-eight million, five hundred seventy-six thousand, nine hundred seventeen".