81422634 has 8 divisors (see below), whose sum is σ = 162845280. Its totient is φ = 27140876.

The previous prime is 81422609. The next prime is 81422651. The reversal of 81422634 is 43622418.

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

81422634 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6785214 + ... + 6785225.

It is an arithmetic number, because the mean of its divisors is an integer number (20355660).

Almost surely, 2^81422634 is an apocalyptic number.

81422634 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.

81422634 is a wasteful number, since it uses less digits than its factorization.

81422634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13570444.

The product of its digits is 9216, while the sum is 30.

The square root of 81422634 is about 9023.4491188237. The cubic root of 81422634 is about 433.4260891513.

The spelling of 81422634 in words is "eighty-one million, four hundred twenty-two thousand, six hundred thirty-four".