780064385 has 4 divisors (see below), whose sum is σ = 936077268. Its totient is φ = 624051504.

The previous prime is 780064381. The next prime is 780064393. The reversal of 780064385 is 583460087.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 583460087 = 7 ⋅83351441.

It can be written as a sum of positive squares in 2 ways, for example, as 275792449 + 504271936 = 16607^2 + 22456^2 .

It is a cyclic number.

It is not a de Polignac number, because 780064385 - 2² = 780064381 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (780064381) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 78006434 + ... + 78006443.

It is an arithmetic number, because the mean of its divisors is an integer number (234019317).

Almost surely, 2^780064385 is an apocalyptic number.

It is an amenable number.

780064385 is a deficient number, since it is larger than the sum of its proper divisors (156012883).

780064385 is a wasteful number, since it uses less digits than its factorization.

780064385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156012882.

The product of its (nonzero) digits is 161280, while the sum is 41.

The square root of 780064385 is about 27929.6327401561. The cubic root of 780064385 is about 920.5417355244.

The spelling of 780064385 in words is "seven hundred eighty million, sixty-four thousand, three hundred eighty-five".