82647681 has 8 divisors (see below), whose sum is σ = 110290944. Its totient is φ = 55051440.

The previous prime is 82647679. The next prime is 82647689. The reversal of 82647681 is 18674628.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 82647681 - 2¹ = 82647679 is a prime.

It is a super-2 number, since 2×82647681² = 13661278349355522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (82647689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7425 + ... + 14846.

It is an arithmetic number, because the mean of its divisors is an integer number (13786368).

Almost surely, 2^82647681 is an apocalyptic number.

It is an amenable number.

82647681 is a deficient number, since it is larger than the sum of its proper divisors (27643263).

82647681 is a wasteful number, since it uses less digits than its factorization.

82647681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23511.

The product of its digits is 129024, while the sum is 42.

The square root of 82647681 is about 9091.0769989039. The cubic root of 82647681 is about 435.5889868042.

The spelling of 82647681 in words is "eighty-two million, six hundred forty-seven thousand, six hundred eighty-one".