81326148 has 24 divisors (see below), whose sum is σ = 194890752. Its totient is φ = 26375904.

The previous prime is 81326143. The next prime is 81326149. The reversal of 81326148 is 84162318.

It is a super-2 number, since 2×81326148² = 13227884697035808, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81326143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91140 + ... + 92027.

It is an arithmetic number, because the mean of its divisors is an integer number (8120448).

Almost surely, 2^81326148 is an apocalyptic number.

It is an amenable number.

81326148 is an abundant number, since it is smaller than the sum of its proper divisors (113564604).

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

81326148 is a wasteful number, since it uses less digits than its factorization.

81326148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183211 (or 183209 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The square root of 81326148 is about 9018.1011305041. The cubic root of 81326148 is about 433.2548178588.

The spelling of 81326148 in words is "eighty-one million, three hundred twenty-six thousand, one hundred forty-eight".