81318696 has 16 divisors (see below), whose sum is σ = 203296800. Its totient is φ = 27106224.

The previous prime is 81318659. The next prime is 81318709. The reversal of 81318696 is 69681318.

It is a super-2 number, since 2×81318696² = 13225460638280832, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1694116 + ... + 1694163.

It is an arithmetic number, because the mean of its divisors is an integer number (12706050).

Almost surely, 2^81318696 is an apocalyptic number.

It is an amenable number.

81318696 is an abundant number, since it is smaller than the sum of its proper divisors (121978104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81318696 is a wasteful number, since it uses less digits than its factorization.

81318696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3388288 (or 3388284 counting only the distinct ones).

The product of its digits is 62208, while the sum is 42.

The square root of 81318696 is about 9017.6879520196. The cubic root of 81318696 is about 433.2415842573.

The spelling of 81318696 in words is "eighty-one million, three hundred eighteen thousand, six hundred ninety-six".