781983855 has 32 divisors (see below), whose sum is σ = 1463366400. Its totient is φ = 395106336.

The previous prime is 781983841. The next prime is 781983883. The reversal of 781983855 is 558389187.

781983855 is a `hidden beast` number, since 78 + 198 + 385 + 5 = 666.

781983855 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 781983855 - 2⁵ = 781983823 is a prime.

It is a super-2 number, since 2×781983855² = 1222997498961322050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 149869 + ... + 154998.

It is an arithmetic number, because the mean of its divisors is an integer number (45730200).

Almost surely, 2^781983855 is an apocalyptic number.

781983855 is a deficient number, since it is larger than the sum of its proper divisors (681382545).

781983855 is a wasteful number, since it uses less digits than its factorization.

781983855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304900 (or 304894 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 54.

The square root of 781983855 is about 27963.9742347185. The cubic root of 781983855 is about 921.2961625391.

The spelling of 781983855 in words is "seven hundred eighty-one million, nine hundred eighty-three thousand, eight hundred fifty-five".