780065 has 16 divisors (see below), whose sum is σ = 1100736. Its totient is φ = 523200.

The previous prime is 780061. The next prime is 780119. The reversal of 780065 is 560087.

It is not a de Polignac number, because 780065 - 2² = 780061 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (780061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170 + ... + 1260.

It is an arithmetic number, because the mean of its divisors is an integer number (68796).

2⁷⁸⁰⁰⁶⁵ is an apocalyptic number.

It is an amenable number.

780065 is a deficient number, since it is larger than the sum of its proper divisors (320671).

780065 is a wasteful number, since it uses less digits than its factorization.

780065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1120.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 780065 is about 883.2128848698. The cubic root of 780065 is about 92.0541977442.

The spelling of 780065 in words is "seven hundred eighty thousand, sixty-five".