5706821781 has 12 divisors (see below), whose sum is σ = 8320227552. Its totient is φ = 3768990696.

The previous prime is 5706821657. The next prime is 5706821831. The reversal of 5706821781 is 1871286075.

It is a happy number.

5706821781 is a `hidden beast` number, since 570 + 6 + 8 + 2 + 1 + 78 + 1 = 666.

5706821781 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 5706821781 - 2¹¹ = 5706819733 is a prime.

It is a super-2 number, since 2×5706821781² = 65135629680192023922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5706823781) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2962081 + ... + 2964006.

It is an arithmetic number, because the mean of its divisors is an integer number (693352296).

Almost surely, 2^5706821781 is an apocalyptic number.

It is an amenable number.

5706821781 is a deficient number, since it is larger than the sum of its proper divisors (2613405771).

5706821781 is a wasteful number, since it uses less digits than its factorization.

5706821781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5926200 (or 5926197 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 45.

The square root of 5706821781 is about 75543.5091917234. The cubic root of 5706821781 is about 1787.0283267920.

The spelling of 5706821781 in words is "five billion, seven hundred six million, eight hundred twenty-one thousand, seven hundred eighty-one".