81940588 has 12 divisors (see below), whose sum is σ = 145124280. Its totient is φ = 40476512.

The previous prime is 81940577. The next prime is 81940619. The reversal of 81940588 is 88504918.

It is an unprimeable number.

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, 123073 + ... + 123736.

It is an arithmetic number, because the mean of its divisors is an integer number (12093690).

Almost surely, 2^81940588 is an apocalyptic number.

It is an amenable number.

81940588 is a deficient number, since it is larger than the sum of its proper divisors (63183692).

81940588 is a wasteful number, since it uses less digits than its factorization.

81940588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246896 (or 246894 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 43.

The square root of 81940588 is about 9052.1040648017. The cubic root of 81940588 is about 434.3431987001.

It can be divided in two parts, 81940 and 588, that added together give a palindrome (82528).

The spelling of 81940588 in words is "eighty-one million, nine hundred forty thousand, five hundred eighty-eight".