82939681 has 16 divisors (see below), whose sum is σ = 96143040. Its totient is φ = 70822080.

The previous prime is 82939639. The next prime is 82939691. The reversal of 82939681 is 18693928.

It is a cyclic number.

It is not a de Polignac number, because 82939681 - 2¹³ = 82931489 is a prime.

It is a super-2 number, since 2×82939681² = 13757981368763522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82939621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8290 + ... + 15316.

It is an arithmetic number, because the mean of its divisors is an integer number (6008940).

Almost surely, 2^82939681 is an apocalyptic number.

It is an amenable number.

82939681 is a deficient number, since it is larger than the sum of its proper divisors (13203359).

82939681 is a wasteful number, since it uses less digits than its factorization.

82939681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7104.

The product of its digits is 186624, while the sum is 46.

The square root of 82939681 is about 9107.1225422743. The cubic root of 82939681 is about 436.1013725651.

The spelling of 82939681 in words is "eighty-two million, nine hundred thirty-nine thousand, six hundred eighty-one".