81814908 has 72 divisors (see below), whose sum is σ = 225808464. Its totient is φ = 22982400.

The previous prime is 81814903. The next prime is 81814927. The reversal of 81814908 is 80941818.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81814903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34728 + ... + 37008.

Almost surely, 2^81814908 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81814908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112904232).

81814908 is an abundant number, since it is smaller than the sum of its proper divisors (143993556).

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

81814908 is a wasteful number, since it uses less digits than its factorization.

81814908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2363 (or 2354 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 39.

The square root of 81814908 is about 9045.1593684136. The cubic root of 81814908 is about 434.1210207075.

The spelling of 81814908 in words is "eighty-one million, eight hundred fourteen thousand, nine hundred eight".