81485338 has 32 divisors (see below), whose sum is σ = 141396480. Its totient is φ = 34830000.

The previous prime is 81485311. The next prime is 81485347. The reversal of 81485338 is 83358418.

It is a self number, because there is not a number n which added to its sum of digits gives 81485338.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62473 + ... + 63763.

It is an arithmetic number, because the mean of its divisors is an integer number (4418640).

Almost surely, 2^81485338 is an apocalyptic number.

81485338 is a deficient number, since it is larger than the sum of its proper divisors (59911142).

81485338 is a wasteful number, since it uses less digits than its factorization.

81485338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1474.

The product of its digits is 92160, while the sum is 40.

The square root of 81485338 is about 9026.9229530333. The cubic root of 81485338 is about 433.5373218418.

Subtracting 81485338 from its reverse (83358418), we obtain a triangular number (1873080 = T₁₉₃₅).

The spelling of 81485338 in words is "eighty-one million, four hundred eighty-five thousand, three hundred thirty-eight".