780755 has 4 divisors (see below), whose sum is σ = 936912. Its totient is φ = 624600.

The previous prime is 780733. The next prime is 780799. The reversal of 780755 is 557087.

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

It is not a de Polignac number, because 780755 - 2⁸ = 780499 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, 78071 + ... + 78080.

It is an arithmetic number, because the mean of its divisors is an integer number (234228).

2⁷⁸⁰⁷⁵⁵ is an apocalyptic number.

780755 is a deficient number, since it is larger than the sum of its proper divisors (156157).

780755 is a wasteful number, since it uses less digits than its factorization.

780755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156156.

The product of its (nonzero) digits is 9800, while the sum is 32.

The square root of 780755 is about 883.6034178295. The cubic root of 780755 is about 92.0813316701.

The spelling of 780755 in words is "seven hundred eighty thousand, seven hundred fifty-five".