81334474 has 8 divisors (see below), whose sum is σ = 131386500. Its totient is φ = 37538976.

The previous prime is 81334471. The next prime is 81334507. The reversal of 81334474 is 47443318.

It can be written as a sum of positive squares in 2 ways, for example, as 79977249 + 1357225 = 8943^2 + 1165^2 .

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

It is not an unprimeable number, because it can be changed into a prime (81334471) by changing a digit.

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, 1564099 + ... + 1564150.

Almost surely, 2^81334474 is an apocalyptic number.

81334474 is a deficient number, since it is larger than the sum of its proper divisors (50052026).

81334474 is a wasteful number, since it uses less digits than its factorization.

81334474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3128264.

The product of its digits is 32256, while the sum is 34.

The square root of 81334474 is about 9018.5627458038. The cubic root of 81334474 is about 433.2696025933.

The spelling of 81334474 in words is "eighty-one million, three hundred thirty-four thousand, four hundred seventy-four".