81828685 has 16 divisors (see below), whose sum is σ = 102385152. Its totient is φ = 62712000.

The previous prime is 81828673. The next prime is 81828697. The reversal of 81828685 is 58682818.

It is an interprime number because it is at equal distance from previous prime (81828673) and next prime (81828697).

It is not a de Polignac number, because 81828685 - 2⁵ = 81828653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 13042 + ... + 18268.

It is an arithmetic number, because the mean of its divisors is an integer number (6399072).

Almost surely, 2^81828685 is an apocalyptic number.

It is an amenable number.

81828685 is a deficient number, since it is larger than the sum of its proper divisors (20556467).

81828685 is a wasteful number, since it uses less digits than its factorization.

81828685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5364.

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

The square root of 81828685 is about 9045.9209039213. The cubic root of 81828685 is about 434.1453868846.

The spelling of 81828685 in words is "eighty-one million, eight hundred twenty-eight thousand, six hundred eighty-five".