81176656 has 40 divisors (see below), whose sum is σ = 173676384. Its totient is φ = 36447360.

The previous prime is 81176651. The next prime is 81176659. The reversal of 81176656 is 65667118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81176651) by changing a digit.

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, 11830 + ... + 17386.

Almost surely, 2^81176656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81176656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86838192).

81176656 is an abundant number, since it is smaller than the sum of its proper divisors (92499728).

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

81176656 is a wasteful number, since it uses less digits than its factorization.

81176656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5659 (or 5653 counting only the distinct ones).

The product of its digits is 60480, while the sum is 40.

The square root of 81176656 is about 9009.8088769962. The cubic root of 81176656 is about 432.9891884291.

The spelling of 81176656 in words is "eighty-one million, one hundred seventy-six thousand, six hundred fifty-six".