81834474 has 8 divisors (see below), whose sum is σ = 163668960. Its totient is φ = 27278156.

The previous prime is 81834469. The next prime is 81834499. The reversal of 81834474 is 47443818.

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

81834474 is an admirable number.

It is a super-2 number, since 2×81834474² = 13393762269713352, which contains 22 as substring.

It is a Curzon 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 3 ways as a sum of consecutive naturals, for example, 6819534 + ... + 6819545.

It is an arithmetic number, because the mean of its divisors is an integer number (20458620).

Almost surely, 2^81834474 is an apocalyptic number.

81834474 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.

81834474 is a wasteful number, since it uses less digits than its factorization.

81834474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13639084.

The product of its digits is 86016, while the sum is 39.

The square root of 81834474 is about 9046.2408767399. The cubic root of 81834474 is about 434.1556245675.

The spelling of 81834474 in words is "eighty-one million, eight hundred thirty-four thousand, four hundred seventy-four".