780988987 has 2 divisors, whose sum is σ = 780988988. Its totient is φ = 780988986.

The previous prime is 780988981. The next prime is 780988997. The reversal of 780988987 is 789889087.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 780988987 - 2³ = 780988979 is a prime.

It is not a weakly prime, because it can be changed into another prime (780988981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390494493 + 390494494.

It is an arithmetic number, because the mean of its divisors is an integer number (390494494).

Almost surely, 2^780988987 is an apocalyptic number.

780988987 is a deficient number, since it is larger than the sum of its proper divisors (1).

780988987 is an equidigital number, since it uses as much as digits as its factorization.

780988987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16257024, while the sum is 64.

The square root of 780988987 is about 27946.1801862079. The cubic root of 780988987 is about 920.9052946899.

The spelling of 780988987 in words is "seven hundred eighty million, nine hundred eighty-eight thousand, nine hundred eighty-seven".