780085667 has 2 divisors, whose sum is σ = 780085668. Its totient is φ = 780085666.

The previous prime is 780085637. The next prime is 780085693. The reversal of 780085667 is 766580087.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 780085667 - 2¹⁸ = 779823523 is a prime.

It is not a weakly prime, because it can be changed into another prime (780085627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390042833 + 390042834.

It is an arithmetic number, because the mean of its divisors is an integer number (390042834).

Almost surely, 2^780085667 is an apocalyptic number.

780085667 is a deficient number, since it is larger than the sum of its proper divisors (1).

780085667 is an equidigital number, since it uses as much as digits as its factorization.

780085667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 564480, while the sum is 47.

The square root of 780085667 is about 27930.0137307521. The cubic root of 780085667 is about 920.5501069663.

The spelling of 780085667 in words is "seven hundred eighty million, eighty-five thousand, six hundred sixty-seven".