780565345 has 12 divisors (see below), whose sum is σ = 1089605844. Its totient is φ = 535244640.

The previous prime is 780565273. The next prime is 780565403. The reversal of 780565345 is 543565087.

It can be written as a sum of positive squares in 2 ways, for example, as 522031104 + 258534241 = 22848^2 + 16079^2 .

It is not a de Polignac number, because 780565345 - 2¹⁷ = 780434273 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1592746 + ... + 1593235.

It is an arithmetic number, because the mean of its divisors is an integer number (90800487).

Almost surely, 2^780565345 is an apocalyptic number.

It is an amenable number.

780565345 is a deficient number, since it is larger than the sum of its proper divisors (309040499).

780565345 is a wasteful number, since it uses less digits than its factorization.

780565345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3186000 (or 3185993 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 43.

The square root of 780565345 is about 27938.5995533062. The cubic root of 780565345 is about 920.7387516996.

The spelling of 780565345 in words is "seven hundred eighty million, five hundred sixty-five thousand, three hundred forty-five".