30843728681 has 4 divisors (see below), whose sum is σ = 30844130052. Its totient is φ = 30843327312.

The previous prime is 30843728651. The next prime is 30843728683. The reversal of 30843728681 is 18682734803.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 8743933081 + 22099795600 = 93509^2 + 148660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30843728681 is a prime.

It is a super-2 number, since 2×30843728681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30843728683) 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, 45326 + ... + 252471.

It is an arithmetic number, because the mean of its divisors is an integer number (7711032513).

Almost surely, 2^30843728681 is an apocalyptic number.

It is an amenable number.

30843728681 is a deficient number, since it is larger than the sum of its proper divisors (401371).

30843728681 is a wasteful number, since it uses less digits than its factorization.

30843728681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401370.

The product of its (nonzero) digits is 1548288, while the sum is 50.

The spelling of 30843728681 in words is "thirty billion, eight hundred forty-three million, seven hundred twenty-eight thousand, six hundred eighty-one".