81813306 has 8 divisors (see below), whose sum is σ = 163626624. Its totient is φ = 27271100.

The previous prime is 81813293. The next prime is 81813331. The reversal of 81813306 is 60331818.

It is a sphenic number, since it is the product of 3 distinct primes.

81813306 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6817770 + ... + 6817781.

It is an arithmetic number, because the mean of its divisors is an integer number (20453328).

Almost surely, 2^81813306 is an apocalyptic number.

81813306 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81813306 is a wasteful number, since it uses less digits than its factorization.

81813306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13635556.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 81813306 is about 9045.0708123265. The cubic root of 81813306 is about 434.1181872124.

The spelling of 81813306 in words is "eighty-one million, eight hundred thirteen thousand, three hundred six".