780505087 has 2 divisors, whose sum is σ = 780505088. Its totient is φ = 780505086.

The previous prime is 780505079. The next prime is 780505091.

780505087 is nontrivially palindromic in base 10.

It is a strong prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 780505087 - 2³ = 780505079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (780500087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390252543 + 390252544.

It is an arithmetic number, because the mean of its divisors is an integer number (390252544).

Almost surely, 2^780505087 is an apocalyptic number.

780505087 is a deficient number, since it is larger than the sum of its proper divisors (1).

780505087 is an equidigital number, since it uses as much as digits as its factorization.

780505087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78400, while the sum is 40.

The square root of 780505087 is about 27937.5211319831. The cubic root of 780505087 is about 920.7150580593.

The spelling of 780505087 in words is "seven hundred eighty million, five hundred five thousand, eighty-seven".