781080 has 64 divisors (see below), whose sum is σ = 2453760. Its totient is φ = 198528.

The previous prime is 781069. The next prime is 781087. The reversal of 781080 is 80187.

It is a super-2 number, since 2×781080² = 1220171932800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 781080.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781087) 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, 2619 + ... + 2901.

It is an arithmetic number, because the mean of its divisors is an integer number (38340).

2⁷⁸¹⁰⁸⁰ 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 781080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1226880).

781080 is an abundant number, since it is smaller than the sum of its proper divisors (1672680).

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

781080 is a wasteful number, since it uses less digits than its factorization.

781080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320 (or 316 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 781080 is about 883.7873047289. The cubic root of 781080 is about 92.0941066043.

The spelling of 781080 in words is "seven hundred eighty-one thousand, eighty".