81836148 has 12 divisors (see below), whose sum is σ = 190951040. Its totient is φ = 27278712.

The previous prime is 81836141. The next prime is 81836177. The reversal of 81836148 is 84163818.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81836141) 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, 3409828 + ... + 3409851.

Almost surely, 2^81836148 is an apocalyptic number.

It is an amenable number.

81836148 is an abundant number, since it is smaller than the sum of its proper divisors (109114892).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81836148 is a wasteful number, since it uses less digits than its factorization.

81836148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6819686 (or 6819684 counting only the distinct ones).

The product of its digits is 36864, while the sum is 39.

The square root of 81836148 is about 9046.3334008868. Note that the first 3 decimals coincide. The cubic root of 81836148 is about 434.1585848991.

The spelling of 81836148 in words is "eighty-one million, eight hundred thirty-six thousand, one hundred forty-eight".