785778997 has 2 divisors, whose sum is σ = 785778998. Its totient is φ = 785778996.

The previous prime is 785778989. The next prime is 785779009. The reversal of 785778997 is 799877587.

785778997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 658743556 + 127035441 = 25666^2 + 11271^2 .

It is a cyclic number.

It is not a de Polignac number, because 785778997 - 2³ = 785778989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (785778937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 392889498 + 392889499.

It is an arithmetic number, because the mean of its divisors is an integer number (392889499).

Almost surely, 2^785778997 is an apocalyptic number.

It is an amenable number.

785778997 is a deficient number, since it is larger than the sum of its proper divisors (1).

785778997 is an equidigital number, since it uses as much as digits as its factorization.

785778997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62233920, while the sum is 67.

The square root of 785778997 is about 28031.7498026791. The cubic root of 785778997 is about 922.7841764711.

The spelling of 785778997 in words is "seven hundred eighty-five million, seven hundred seventy-eight thousand, nine hundred ninety-seven".