781066 has 16 divisors (see below), whose sum is σ = 1376928. Its totient is φ = 327600.

The previous prime is 781063. The next prime is 781069. The reversal of 781066 is 660187.

It is an interprime number because it is at equal distance from previous prime (781063) and next prime (781069).

It is a super-2 number, since 2×781066² = 1220128192712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (781063) 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 7 ways as a sum of consecutive naturals, for example, 1080 + ... + 1651.

It is an arithmetic number, because the mean of its divisors is an integer number (86058).

2⁷⁸¹⁰⁶⁶ is an apocalyptic number.

781066 is a deficient number, since it is larger than the sum of its proper divisors (595862).

781066 is a wasteful number, since it uses less digits than its factorization.

781066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2757.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 781066 is about 883.7793842357. The cubic root of 781066 is about 92.0935563725.

The spelling of 781066 in words is "seven hundred eighty-one thousand, sixty-six".