81830526 has 8 divisors (see below), whose sum is σ = 163661064. Its totient is φ = 27276840.

The previous prime is 81830521. The next prime is 81830531. The reversal of 81830526 is 62503818.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81830521) and next prime (81830531).

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

81830526 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81830521) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 6819205 + ... + 6819216.

It is an arithmetic number, because the mean of its divisors is an integer number (20457633).

Almost surely, 2^81830526 is an apocalyptic number.

81830526 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.

81830526 is a wasteful number, since it uses less digits than its factorization.

81830526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13638426.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 81830526 is about 9046.0226619216. The cubic root of 81830526 is about 434.1486426934.

The spelling of 81830526 in words is "eighty-one million, eight hundred thirty thousand, five hundred twenty-six".