780055825 has 12 divisors (see below), whose sum is σ = 976849308. Its totient is φ = 617864000.

The previous prime is 780055813. The next prime is 780055853. The reversal of 780055825 is 528550087.

It can be written as a sum of positive squares in 6 ways, for example, as 8994001 + 771061824 = 2999^2 + 27768^2 .

It is not a de Polignac number, because 780055825 - 2⁹ = 780055313 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 151942 + ... + 156991.

It is an arithmetic number, because the mean of its divisors is an integer number (81404109).

Almost surely, 2^780055825 is an apocalyptic number.

It is an amenable number.

780055825 is a deficient number, since it is larger than the sum of its proper divisors (196793483).

780055825 is a wasteful number, since it uses less digits than its factorization.

780055825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309044 (or 309039 counting only the distinct ones).

The product of its (nonzero) digits is 112000, while the sum is 40.

The square root of 780055825 is about 27929.4794974772. The cubic root of 780055825 is about 920.5383683382.

The spelling of 780055825 in words is "seven hundred eighty million, fifty-five thousand, eight hundred twenty-five".