81797108 has 24 divisors (see below), whose sum is σ = 152554752. Its totient is φ = 38285984.

The previous prime is 81797063. The next prime is 81797117. The reversal of 81797108 is 80179718.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5135 + ... + 13782.

It is an arithmetic number, because the mean of its divisors is an integer number (6356448).

Almost surely, 2^81797108 is an apocalyptic number.

It is an amenable number.

81797108 is a deficient number, since it is larger than the sum of its proper divisors (70757644).

81797108 is a wasteful number, since it uses less digits than its factorization.

81797108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18991 (or 18989 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 41.

The square root of 81797108 is about 9044.1753631826. The cubic root of 81797108 is about 434.0895353510.

It can be divided in two parts, 8179710 and 8, that added together give a palindrome (8179718).

The spelling of 81797108 in words is "eighty-one million, seven hundred ninety-seven thousand, one hundred eight".