82881805 has 8 divisors (see below), whose sum is σ = 99703800. Its totient is φ = 66141696.

The previous prime is 82881803. The next prime is 82881809. The reversal of 82881805 is 50818828.

It can be written as a sum of positive squares in 4 ways, for example, as 46267204 + 36614601 = 6802^2 + 6051^2 .

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 82881805 - 2¹ = 82881803 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82881803) 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 7 ways as a sum of consecutive naturals, for example, 18220 + ... + 22309.

It is an arithmetic number, because the mean of its divisors is an integer number (12462975).

Almost surely, 2^82881805 is an apocalyptic number.

It is an amenable number.

82881805 is a deficient number, since it is larger than the sum of its proper divisors (16821995).

82881805 is a wasteful number, since it uses less digits than its factorization.

82881805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40943.

The product of its (nonzero) digits is 40960, while the sum is 40.

The square root of 82881805 is about 9103.9444747867. The cubic root of 82881805 is about 435.9999105715. Note that the first 4 decimals are identical.

The spelling of 82881805 in words is "eighty-two million, eight hundred eighty-one thousand, eight hundred five".