782380561 has 4 divisors (see below), whose sum is σ = 785797300. Its totient is φ = 778963824.

The previous prime is 782380549. The next prime is 782380567. The reversal of 782380561 is 165083287.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 733380561 + 49000000 = 27081^2 + 7000^2 .

It is a cyclic number.

It is not a de Polignac number, because 782380561 - 2⁷ = 782380433 is a prime.

It is a super-2 number, since 2×782380561² = 1224238684461349442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (782380567) 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 in 3 ways as a sum of consecutive naturals, for example, 1708026 + ... + 1708483.

It is an arithmetic number, because the mean of its divisors is an integer number (196449325).

Almost surely, 2^782380561 is an apocalyptic number.

It is an amenable number.

782380561 is a deficient number, since it is larger than the sum of its proper divisors (3416739).

782380561 is a wasteful number, since it uses less digits than its factorization.

782380561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3416738.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 782380561 is about 27971.0664973647. The cubic root of 782380561 is about 921.4519295780.

The spelling of 782380561 in words is "seven hundred eighty-two million, three hundred eighty thousand, five hundred sixty-one".