81934374 has 8 divisors (see below), whose sum is σ = 163868760. Its totient is φ = 27311456.

The previous prime is 81934361. The next prime is 81934399. The reversal of 81934374 is 47343918.

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

81934374 is an admirable number.

It is a congruent 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, 6827859 + ... + 6827870.

It is an arithmetic number, because the mean of its divisors is an integer number (20483595).

Almost surely, 2^81934374 is an apocalyptic number.

81934374 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.

81934374 is a wasteful number, since it uses less digits than its factorization.

81934374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13655734.

The product of its digits is 72576, while the sum is 39.

The square root of 81934374 is about 9051.7608231769. The cubic root of 81934374 is about 434.3322188876.

The spelling of 81934374 in words is "eighty-one million, nine hundred thirty-four thousand, three hundred seventy-four".