81837908 has 12 divisors (see below), whose sum is σ = 143592960. Its totient is φ = 40811352.

The previous prime is 81837907. The next prime is 81837947. The reversal of 81837908 is 80973818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81837907) 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, 25178 + ... + 28241.

It is an arithmetic number, because the mean of its divisors is an integer number (11966080).

Almost surely, 2^81837908 is an apocalyptic number.

It is an amenable number.

81837908 is a deficient number, since it is larger than the sum of its proper divisors (61755052).

81837908 is a wasteful number, since it uses less digits than its factorization.

81837908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53806 (or 53804 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 81837908 is about 9046.4306773445. The cubic root of 81837908 is about 434.1616972712.

The spelling of 81837908 in words is "eighty-one million, eight hundred thirty-seven thousand, nine hundred eight".