828778770397 has 2 divisors, whose sum is σ = 828778770398. Its totient is φ = 828778770396.

The previous prime is 828778770389. The next prime is 828778770401. The reversal of 828778770397 is 793077877828.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 529800559876 + 298978210521 = 727874^2 + 546789^2 .

It is a cyclic number.

It is not a de Polignac number, because 828778770397 - 2³ = 828778770389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (828778770697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 414389385198 + 414389385199.

It is an arithmetic number, because the mean of its divisors is an integer number (414389385199).

Almost surely, 2^828778770397 is an apocalyptic number.

It is an amenable number.

828778770397 is a deficient number, since it is larger than the sum of its proper divisors (1).

828778770397 is an equidigital number, since it uses as much as digits as its factorization.

828778770397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 464679936, while the sum is 73.

The spelling of 828778770397 in words is "eight hundred twenty-eight billion, seven hundred seventy-eight million, seven hundred seventy thousand, three hundred ninety-seven".