782779057 has 2 divisors, whose sum is σ = 782779058. Its totient is φ = 782779056.

The previous prime is 782779051. The next prime is 782779069. The reversal of 782779057 is 750977287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 684293281 + 98485776 = 26159^2 + 9924^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-782779057 is a prime.

It is a super-2 number, since 2×782779057² = 1225486104155618498, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 782778995 and 782779013.

It is not a weakly prime, because it can be changed into another prime (782779051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 391389528 + 391389529.

It is an arithmetic number, because the mean of its divisors is an integer number (391389529).

Almost surely, 2^782779057 is an apocalyptic number.

It is an amenable number.

782779057 is a deficient number, since it is larger than the sum of its proper divisors (1).

782779057 is an equidigital number, since it uses as much as digits as its factorization.

782779057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728720, while the sum is 52.

The square root of 782779057 is about 27978.1889513957. The cubic root of 782779057 is about 921.6083464600.

The spelling of 782779057 in words is "seven hundred eighty-two million, seven hundred seventy-nine thousand, fifty-seven".