81882586 has 8 divisors (see below), whose sum is σ = 123172884. Its totient is φ = 40824960.

The previous prime is 81882583. The next prime is 81882587. The reversal of 81882586 is 68528818.

It can be written as a sum of positive squares in 2 ways, for example, as 81342361 + 540225 = 9019^2 + 735^2 .

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

It is not an unprimeable number, because it can be changed into a prime (81882583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57285 + ... + 58696.

Almost surely, 2^81882586 is an apocalyptic number.

81882586 is a deficient number, since it is larger than the sum of its proper divisors (41290298).

81882586 is a wasteful number, since it uses less digits than its factorization.

81882586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116336.

The product of its digits is 245760, while the sum is 46.

The square root of 81882586 is about 9048.8997121197. The cubic root of 81882586 is about 434.2406906047.

The spelling of 81882586 in words is "eighty-one million, eight hundred eighty-two thousand, five hundred eighty-six".