82821881 has 8 divisors (see below), whose sum is σ = 85137480. Its totient is φ = 80534272.

The previous prime is 82821859. The next prime is 82821889. The reversal of 82821881 is 18812828.

It can be written as a sum of positive squares in 4 ways, for example, as 11881 + 82810000 = 109^2 + 9100^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82821881 is a prime.

It is a super-2 number, since 2×82821881² = 13718927944756322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82821889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 926 + ... + 12903.

It is an arithmetic number, because the mean of its divisors is an integer number (10642185).

Almost surely, 2^82821881 is an apocalyptic number.

It is an amenable number.

82821881 is a deficient number, since it is larger than the sum of its proper divisors (2315599).

82821881 is a wasteful number, since it uses less digits than its factorization.

82821881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13995.

The product of its digits is 16384, while the sum is 38.

The square root of 82821881 is about 9100.6527787846. The cubic root of 82821881 is about 435.8948084613.

The spelling of 82821881 in words is "eighty-two million, eight hundred twenty-one thousand, eight hundred eighty-one".