676779391 has 2 divisors, whose sum is σ = 676779392. Its totient is φ = 676779390.

The previous prime is 676779371. The next prime is 676779403. The reversal of 676779391 is 193977676.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 676779391 - 2⁵ = 676779359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (676779361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 338389695 + 338389696.

It is an arithmetic number, because the mean of its divisors is an integer number (338389696).

Almost surely, 2^676779391 is an apocalyptic number.

676779391 is a deficient number, since it is larger than the sum of its proper divisors (1).

676779391 is an equidigital number, since it uses as much as digits as its factorization.

676779391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3000564, while the sum is 55.

The square root of 676779391 is about 26014.9839707811. The cubic root of 676779391 is about 877.9754556298.

The spelling of 676779391 in words is "six hundred seventy-six million, seven hundred seventy-nine thousand, three hundred ninety-one".