780678 has 40 divisors (see below), whose sum is σ = 1800480. Its totient is φ = 252720.

The previous prime is 780671. The next prime is 780679. The reversal of 780678 is 876087.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780671) by changing a digit.

780678 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 19 ways as a sum of consecutive naturals, for example, 9843 + ... + 9921.

It is an arithmetic number, because the mean of its divisors is an integer number (45012).

2⁷⁸⁰⁶⁷⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 780678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (900240).

780678 is an abundant number, since it is smaller than the sum of its proper divisors (1019802).

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

780678 is a wasteful number, since it uses less digits than its factorization.

780678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154 (or 145 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 780678 is about 883.5598451718. The cubic root of 780678 is about 92.0783044739.

The spelling of 780678 in words is "seven hundred eighty thousand, six hundred seventy-eight".