81318832 has 30 divisors (see below), whose sum is σ = 183280308. Its totient is φ = 34850592.

The previous prime is 81318829. The next prime is 81318833. The reversal of 81318832 is 23881318.

It is a super-2 number, since 2×81318832² = 13225504875688448, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81318833) 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 5 ways as a sum of consecutive naturals, for example, 51078 + ... + 52645.

Almost surely, 2^81318832 is an apocalyptic number.

It is an amenable number.

81318832 is an abundant number, since it is smaller than the sum of its proper divisors (101961476).

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

81318832 is a wasteful number, since it uses less digits than its factorization.

81318832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103745 (or 103732 counting only the distinct ones).

The product of its digits is 9216, while the sum is 34.

The square root of 81318832 is about 9017.6954927520. The cubic root of 81318832 is about 433.2418257795.

The spelling of 81318832 in words is "eighty-one million, three hundred eighteen thousand, eight hundred thirty-two".