81700286 has 8 divisors (see below), whose sum is σ = 124229424. Its totient is φ = 40290480.

The previous prime is 81700277. The next prime is 81700291. The reversal of 81700286 is 68200718.

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 279650 + ... + 279941.

It is an arithmetic number, because the mean of its divisors is an integer number (15528678).

Almost surely, 2^81700286 is an apocalyptic number.

81700286 is a deficient number, since it is larger than the sum of its proper divisors (42529138).

81700286 is a wasteful number, since it uses less digits than its factorization.

81700286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559666.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 81700286 is about 9038.8210514425. The cubic root of 81700286 is about 433.9181926547.

The spelling of 81700286 in words is "eighty-one million, seven hundred thousand, two hundred eighty-six".