780845 has 16 divisors (see below), whose sum is σ = 1037232. Its totient is φ = 560640.

The previous prime is 780841. The next prime is 780851. The reversal of 780845 is 548087.

It can be written as a sum of positive squares in 8 ways, for example, as 56644 + 724201 = 238^2 + 851^2 .

It is not a de Polignac number, because 780845 - 2² = 780841 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2519 + ... + 2811.

It is an arithmetic number, because the mean of its divisors is an integer number (64827).

2⁷⁸⁰⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

780845 is a deficient number, since it is larger than the sum of its proper divisors (256387).

780845 is a wasteful number, since it uses less digits than its factorization.

780845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352.

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 780845 is about 883.6543441867. The cubic root of 780845 is about 92.0848696990.

The spelling of 780845 in words is "seven hundred eighty thousand, eight hundred forty-five".