780256 has 24 divisors (see below), whose sum is σ = 1580040. Its totient is φ = 379008.

The previous prime is 780253. The next prime is 780257. The reversal of 780256 is 652087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 855 + ... + 1513.

It is an arithmetic number, because the mean of its divisors is an integer number (65835).

2⁷⁸⁰²⁵⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 780256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (790020).

780256 is an abundant number, since it is smaller than the sum of its proper divisors (799784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

780256 is a wasteful number, since it uses less digits than its factorization.

780256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706 (or 698 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 780256 is about 883.3210062033. The cubic root of 780256 is about 92.0617103305.

The spelling of 780256 in words is "seven hundred eighty thousand, two hundred fifty-six".