781116 has 48 divisors (see below), whose sum is σ = 2209536. Its totient is φ = 209664.

The previous prime is 781111. The next prime is 781117. The reversal of 781116 is 611187.

It is a super-2 number, since 2×781116² = 1220284410912, which contains 22 as substring.

It is a nialpdrome in base 7.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 781116.

It is not an unprimeable number, because it can be changed into a prime (781111) by changing a digit.

781116 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 (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1155 + ... + 1701.

It is an arithmetic number, because the mean of its divisors is an integer number (46032).

2⁷⁸¹¹¹⁶ 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 781116, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1104768).

781116 is an abundant number, since it is smaller than the sum of its proper divisors (1428420).

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

781116 is a wasteful number, since it uses less digits than its factorization.

781116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578 (or 576 counting only the distinct ones).

The product of its digits is 336, while the sum is 24.

The square root of 781116 is about 883.8076713856. The cubic root of 781116 is about 92.0955214559.

The spelling of 781116 in words is "seven hundred eighty-one thousand, one hundred sixteen".