81079512 has 32 divisors (see below), whose sum is σ = 207014400. Its totient is φ = 26451104.

The previous prime is 81079501. The next prime is 81079513. The reversal of 81079512 is 21597018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81079513) 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 7 ways as a sum of consecutive naturals, for example, 34812 + ... + 37067.

It is an arithmetic number, because the mean of its divisors is an integer number (6469200).

Almost surely, 2^81079512 is an apocalyptic number.

It is an amenable number.

81079512 is an abundant number, since it is smaller than the sum of its proper divisors (125934888).

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

81079512 is a wasteful number, since it uses less digits than its factorization.

81079512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71935 (or 71931 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 81079512 is about 9004.4162498188. The cubic root of 81079512 is about 432.8164002837.

The spelling of 81079512 in words is "eighty-one million, seventy-nine thousand, five hundred twelve".