81579560 has 32 divisors (see below), whose sum is σ = 183853800. Its totient is φ = 32578560.

The previous prime is 81579539. The next prime is 81579571. The reversal of 81579560 is 6597518.

It can be written as a sum of positive squares in 4 ways, for example, as 53553124 + 28026436 = 7318^2 + 5294^2 .

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, 31100 + ... + 33620.

Almost surely, 2^81579560 is an apocalyptic number.

It is an amenable number.

81579560 is an abundant number, since it is smaller than the sum of its proper divisors (102274240).

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

81579560 is a wasteful number, since it uses less digits than its factorization.

81579560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3341 (or 3337 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 41.

The square root of 81579560 is about 9032.1403886344. The cubic root of 81579560 is about 433.7043581050.

The spelling of 81579560 in words is "eighty-one million, five hundred seventy-nine thousand, five hundred sixty".