81823088 has 20 divisors (see below), whose sum is σ = 161221080. Its totient is φ = 40217664.

The previous prime is 81823087. The next prime is 81823103. The reversal of 81823088 is 88032818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81823087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42395 + ... + 44282.

It is an arithmetic number, because the mean of its divisors is an integer number (8061054).

Almost surely, 2^81823088 is an apocalyptic number.

It is an amenable number.

81823088 is a deficient number, since it is larger than the sum of its proper divisors (79397992).

81823088 is a wasteful number, since it uses less digits than its factorization.

81823088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86744 (or 86738 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 38.

The square root of 81823088 is about 9045.6115326715. The cubic root of 81823088 is about 434.1354882892.

The spelling of 81823088 in words is "eighty-one million, eight hundred twenty-three thousand, eighty-eight".