81475336 has 16 divisors (see below), whose sum is σ = 153560700. Its totient is φ = 40525824.

The previous prime is 81475333. The next prime is 81475349. The reversal of 81475336 is 63357418.

It can be written as a sum of positive squares in 2 ways, for example, as 76212900 + 5262436 = 8730^2 + 2294^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81475295 and 81475304.

It is not an unprimeable number, because it can be changed into a prime (81475333) by changing a digit.

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, 24841 + ... + 27928.

Almost surely, 2^81475336 is an apocalyptic number.

It is an amenable number.

81475336 is a deficient number, since it is larger than the sum of its proper divisors (72085364).

81475336 is a wasteful number, since it uses less digits than its factorization.

81475336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52968 (or 52964 counting only the distinct ones).

The product of its digits is 60480, while the sum is 37.

The square root of 81475336 is about 9026.3689266504. The cubic root of 81475336 is about 433.5195827907.

The spelling of 81475336 in words is "eighty-one million, four hundred seventy-five thousand, three hundred thirty-six".