81676986 has 8 divisors (see below), whose sum is σ = 163353984. Its totient is φ = 27225660.

The previous prime is 81676981. The next prime is 81677003. The reversal of 81676986 is 68967618.

It is a happy number.

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

81676986 is an admirable number.

It is a super-3 number, since 3×81676986³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (81676981) 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, 6806410 + ... + 6806421.

It is an arithmetic number, because the mean of its divisors is an integer number (20419248).

Almost surely, 2^81676986 is an apocalyptic number.

81676986 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81676986 is a wasteful number, since it uses less digits than its factorization.

81676986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13612836.

The product of its digits is 870912, while the sum is 51.

The square root of 81676986 is about 9037.5320746319. The cubic root of 81676986 is about 433.8769392081.

The spelling of 81676986 in words is "eighty-one million, six hundred seventy-six thousand, nine hundred eighty-six".