780679 has 2 divisors, whose sum is σ = 780680. Its totient is φ = 780678.

The previous prime is 780671. The next prime is 780683. The reversal of 780679 is 976087.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 780679 - 2³ = 780671 is a prime.

780679 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (780671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390339 + 390340.

It is an arithmetic number, because the mean of its divisors is an integer number (390340).

2⁷⁸⁰⁶⁷⁹ is an apocalyptic number.

780679 is a deficient number, since it is larger than the sum of its proper divisors (1).

780679 is an equidigital number, since it uses as much as digits as its factorization.

780679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 780679 is about 883.5604110642. The cubic root of 780679 is about 92.0783437894.

The spelling of 780679 in words is "seven hundred eighty thousand, six hundred seventy-nine".