82985681 has 8 divisors (see below), whose sum is σ = 86405928. Its totient is φ = 79632000.

The previous prime is 82985677. The next prime is 82985689. The reversal of 82985681 is 18658928.

It can be written as a sum of positive squares in 4 ways, for example, as 4060225 + 78925456 = 2015^2 + 8884^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 82985681 - 2² = 82985677 is a prime.

It is a super-2 number, since 2×82985681² = 13773246502067522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82985689) 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, 14090 + ... + 19091.

It is an arithmetic number, because the mean of its divisors is an integer number (10800741).

Almost surely, 2^82985681 is an apocalyptic number.

It is an amenable number.

82985681 is a deficient number, since it is larger than the sum of its proper divisors (3420247).

82985681 is a wasteful number, since it uses less digits than its factorization.

82985681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33283.

The product of its digits is 276480, while the sum is 47.

The square root of 82985681 is about 9109.6476880283. The cubic root of 82985681 is about 436.1819811687.

The spelling of 82985681 in words is "eighty-two million, nine hundred eighty-five thousand, six hundred eighty-one".