81076556 has 24 divisors (see below), whose sum is σ = 155495424. Its totient is φ = 36683280.

The previous prime is 81076549. The next prime is 81076571. The reversal of 81076556 is 65567018.

It is a happy number.

It is a super-2 number, since 2×81076556² = 13146815865642272, which contains 22 as substring.

It is an unprimeable number.

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, 5681 + ... + 13943.

It is an arithmetic number, because the mean of its divisors is an integer number (6478976).

Almost surely, 2^81076556 is an apocalyptic number.

It is an amenable number.

81076556 is a deficient number, since it is larger than the sum of its proper divisors (74418868).

81076556 is a wasteful number, since it uses less digits than its factorization.

81076556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8501 (or 8499 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 81076556 is about 9004.2521066438. The cubic root of 81076556 is about 432.8111403408.

The spelling of 81076556 in words is "eighty-one million, seventy-six thousand, five hundred fifty-six".