785580385 has 4 divisors (see below), whose sum is σ = 942696468. Its totient is φ = 628464304.

The previous prime is 785580379. The next prime is 785580401. The reversal of 785580385 is 583085587.

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 479785216 + 305795169 = 21904^2 + 17487^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-785580385 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78558034 + ... + 78558043.

It is an arithmetic number, because the mean of its divisors is an integer number (235674117).

Almost surely, 2^785580385 is an apocalyptic number.

It is an amenable number.

785580385 is a deficient number, since it is larger than the sum of its proper divisors (157116083).

785580385 is a wasteful number, since it uses less digits than its factorization.

785580385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157116082.

The product of its (nonzero) digits is 1344000, while the sum is 49.

The square root of 785580385 is about 28028.2069529965. The cubic root of 785580385 is about 922.7064228639.

The spelling of 785580385 in words is "seven hundred eighty-five million, five hundred eighty thousand, three hundred eighty-five".