81208474 has 8 divisors (see below), whose sum is σ = 121873248. Its totient is φ = 40584060.

The previous prime is 81208471. The next prime is 81208481. The reversal of 81208474 is 47480218.

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 (81208471) 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, 4422 + ... + 13489.

It is an arithmetic number, because the mean of its divisors is an integer number (15234156).

Almost surely, 2^81208474 is an apocalyptic number.

81208474 is a deficient number, since it is larger than the sum of its proper divisors (40664774).

81208474 is a wasteful number, since it uses less digits than its factorization.

81208474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20180.

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 81208474 is about 9011.5744462330. The cubic root of 81208474 is about 433.0457525165.

The spelling of 81208474 in words is "eighty-one million, two hundred eight thousand, four hundred seventy-four".