780667 has 2 divisors, whose sum is σ = 780668. Its totient is φ = 780666.

The previous prime is 780649. The next prime is 780671. The reversal of 780667 is 766087.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-780667 is a prime.

It is not a weakly prime, because it can be changed into another prime (780697) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390333 + 390334.

It is an arithmetic number, because the mean of its divisors is an integer number (390334).

2⁷⁸⁰⁶⁶⁷ is an apocalyptic number.

780667 is a deficient number, since it is larger than the sum of its proper divisors (1).

780667 is an equidigital number, since it uses as much as digits as its factorization.

780667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 780667 is about 883.5536203310. The cubic root of 780667 is about 92.0778720010.

The spelling of 780667 in words is "seven hundred eighty thousand, six hundred sixty-seven".