787878797 has 2 divisors, whose sum is σ = 787878798. Its totient is φ = 787878796.

The previous prime is 787878781. The next prime is 787878799. The reversal of 787878797 is 797878787.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 672831721 + 115047076 = 25939^2 + 10726^2 .

It is an emirp because it is prime and its reverse (797878787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 787878797 - 2⁴ = 787878781 is a prime.

Together with 787878799, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (787878799) 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, 393939398 + 393939399.

It is an arithmetic number, because the mean of its divisors is an integer number (393939399).

Almost surely, 2^787878797 is an apocalyptic number.

It is an amenable number.

787878797 is a deficient number, since it is larger than the sum of its proper divisors (1).

787878797 is an equidigital number, since it uses as much as digits as its factorization.

787878797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77446656, while the sum is 68.

The square root of 787878797 is about 28069.1787731668. The cubic root of 787878797 is about 923.6054162025.

The spelling of 787878797 in words is "seven hundred eighty-seven million, eight hundred seventy-eight thousand, seven hundred ninety-seven".