781868 has 12 divisors (see below), whose sum is σ = 1391880. Its totient is φ = 384192.

The previous prime is 781867. The next prime is 781883. The reversal of 781868 is 868187.

It is a super-2 number, since 2×781868² = 1222635138848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (781861) 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, 1421 + ... + 1892.

It is an arithmetic number, because the mean of its divisors is an integer number (115990).

2⁷⁸¹⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

781868 is a deficient number, since it is larger than the sum of its proper divisors (610012).

781868 is a wasteful number, since it uses less digits than its factorization.

781868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3376 (or 3374 counting only the distinct ones).

The product of its digits is 21504, while the sum is 38.

The square root of 781868 is about 884.2330009675. The cubic root of 781868 is about 92.1250662010.

The spelling of 781868 in words is "seven hundred eighty-one thousand, eight hundred sixty-eight".