81024656 has 20 divisors (see below), whose sum is σ = 157309500. Its totient is φ = 40428672.

The previous prime is 81024631. The next prime is 81024659. The reversal of 81024656 is 65642018.

It can be written as a sum of positive squares in 2 ways, for example, as 49843600 + 31181056 = 7060^2 + 5584^2 .

It is not an unprimeable number, because it can be changed into a prime (81024659) 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 3 ways as a sum of consecutive naturals, for example, 3170 + ... + 13118.

It is an arithmetic number, because the mean of its divisors is an integer number (7865475).

Almost surely, 2^81024656 is an apocalyptic number.

It is an amenable number.

81024656 is a deficient number, since it is larger than the sum of its proper divisors (76284844).

81024656 is a wasteful number, since it uses less digits than its factorization.

81024656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10466 (or 10460 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 81024656 is about 9001.3696735552. The cubic root of 81024656 is about 432.7187680032.

The spelling of 81024656 in words is "eighty-one million, twenty-four thousand, six hundred fifty-six".