81828258 has 8 divisors (see below), whose sum is σ = 163656528. Its totient is φ = 27276084.

The previous prime is 81828223. The next prime is 81828277. The reversal of 81828258 is 85282818.

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

81828258 is an admirable number.

It is a Curzon number.

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 3 ways as a sum of consecutive naturals, for example, 6819016 + ... + 6819027.

It is an arithmetic number, because the mean of its divisors is an integer number (20457066).

Almost surely, 2^81828258 is an apocalyptic number.

81828258 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.

81828258 is a wasteful number, since it uses less digits than its factorization.

81828258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13638048.

The product of its digits is 81920, while the sum is 42.

The square root of 81828258 is about 9045.8973020923. The cubic root of 81828258 is about 434.1446317280.

The spelling of 81828258 in words is "eighty-one million, eight hundred twenty-eight thousand, two hundred fifty-eight".