81960056 has 8 divisors (see below), whose sum is σ = 153675120. Its totient is φ = 40980024.

The previous prime is 81960049. The next prime is 81960071. The reversal of 81960056 is 65006918.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 81959998 and 81960025.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 5122496 + ... + 5122511.

It is an arithmetic number, because the mean of its divisors is an integer number (19209390).

Almost surely, 2^81960056 is an apocalyptic number.

It is an amenable number.

81960056 is a deficient number, since it is larger than the sum of its proper divisors (71715064).

81960056 is a wasteful number, since it uses less digits than its factorization.

81960056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10245013 (or 10245009 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 81960056 is about 9053.1793310417. The cubic root of 81960056 is about 434.3775940428.

The spelling of 81960056 in words is "eighty-one million, nine hundred sixty thousand, fifty-six".