81593828 has 12 divisors (see below), whose sum is σ = 150304560. Its totient is φ = 38649672.

The previous prime is 81593821. The next prime is 81593851. The reversal of 81593828 is 82839518.

It is not an unprimeable number, because it can be changed into a prime (81593821) 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, 536726 + ... + 536877.

It is an arithmetic number, because the mean of its divisors is an integer number (12525380).

Almost surely, 2^81593828 is an apocalyptic number.

It is an amenable number.

81593828 is a deficient number, since it is larger than the sum of its proper divisors (68710732).

81593828 is a wasteful number, since it uses less digits than its factorization.

81593828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073626 (or 1073624 counting only the distinct ones).

The product of its digits is 138240, while the sum is 44.

The square root of 81593828 is about 9032.9302001067. The cubic root of 81593828 is about 433.7296411255.

The spelling of 81593828 in words is "eighty-one million, five hundred ninety-three thousand, eight hundred twenty-eight".