81476656 has 20 divisors (see below), whose sum is σ = 158563512. Its totient is φ = 40557056.

The previous prime is 81476653. The next prime is 81476669. The reversal of 81476656 is 65667418.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81476651) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7585 + ... + 14848.

Almost surely, 2^81476656 is an apocalyptic number.

It is an amenable number.

81476656 is a deficient number, since it is larger than the sum of its proper divisors (77086856).

81476656 is a wasteful number, since it uses less digits than its factorization.

81476656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22668 (or 22662 counting only the distinct ones).

The product of its digits is 241920, while the sum is 43.

The square root of 81476656 is about 9026.4420454573. The cubic root of 81476656 is about 433.5219239604.

The spelling of 81476656 in words is "eighty-one million, four hundred seventy-six thousand, six hundred fifty-six".