81850008 has 32 divisors (see below), whose sum is σ = 213523200. Its totient is φ = 26096928.

The previous prime is 81849997. The next prime is 81850033. The reversal of 81850008 is 80005818.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 73588 + ... + 74691.

It is an arithmetic number, because the mean of its divisors is an integer number (6672600).

Almost surely, 2^81850008 is an apocalyptic number.

It is an amenable number.

81850008 is an abundant number, since it is smaller than the sum of its proper divisors (131673192).

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

81850008 is a wasteful number, since it uses less digits than its factorization.

81850008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148311 (or 148307 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 30.

The square root of 81850008 is about 9047.0994246775. The cubic root of 81850008 is about 434.1830936216.

The spelling of 81850008 in words is "eighty-one million, eight hundred fifty thousand, eight".