81836616 has 32 divisors (see below), whose sum is σ = 205732800. Its totient is φ = 27126720.

The previous prime is 81836609. The next prime is 81836627. The reversal of 81836616 is 61663818.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5076 + ... + 13763.

It is an arithmetic number, because the mean of its divisors is an integer number (6429150).

Almost surely, 2^81836616 is an apocalyptic number.

It is an amenable number.

81836616 is an abundant number, since it is smaller than the sum of its proper divisors (123896184).

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

81836616 is a wasteful number, since it uses less digits than its factorization.

81836616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19029 (or 19025 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 81836616 is about 9046.3592676833. The cubic root of 81836616 is about 434.1594125115.

The spelling of 81836616 in words is "eighty-one million, eight hundred thirty-six thousand, six hundred sixteen".