82561012 has 12 divisors (see below), whose sum is σ = 144861696. Its totient is φ = 41171960.

The previous prime is 82561009. The next prime is 82561021. The reversal of 82561012 is 21016528.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25414 + ... + 28477.

It is an arithmetic number, because the mean of its divisors is an integer number (12071808).

Almost surely, 2^82561012 is an apocalyptic number.

It is an amenable number.

82561012 is a deficient number, since it is larger than the sum of its proper divisors (62300684).

82561012 is a wasteful number, since it uses less digits than its factorization.

82561012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54278 (or 54276 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 82561012 is about 9086.3090416296. The cubic root of 82561012 is about 435.4366725249.

The spelling of 82561012 in words is "eighty-two million, five hundred sixty-one thousand, twelve".