81319468 has 24 divisors (see below), whose sum is σ = 150187520. Its totient is φ = 38419920.

The previous prime is 81319457. The next prime is 81319531. The reversal of 81319468 is 86491318.

It is a super-2 number, since 2×81319468² = 13225711751606048, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81319468.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 34033 + ... + 36343.

Almost surely, 2^81319468 is an apocalyptic number.

It is an amenable number.

81319468 is a deficient number, since it is larger than the sum of its proper divisors (68868052).

81319468 is a wasteful number, since it uses less digits than its factorization.

81319468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2797 (or 2795 counting only the distinct ones).

The product of its digits is 41472, while the sum is 40.

The square root of 81319468 is about 9017.7307566815. The cubic root of 81319468 is about 433.2429552476.

The spelling of 81319468 in words is "eighty-one million, three hundred nineteen thousand, four hundred sixty-eight".