81086850 has 144 divisors (see below), whose sum is σ = 238859712. Its totient is φ = 19601280.

The previous prime is 81086791. The next prime is 81086861. The reversal of 81086850 is 5868018.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 485467 + ... + 485633.

It is an arithmetic number, because the mean of its divisors is an integer number (1658748).

Almost surely, 2^81086850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81086850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119429856).

81086850 is an abundant number, since it is smaller than the sum of its proper divisors (157772862).

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

81086850 is a wasteful number, since it uses less digits than its factorization.

81086850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281 (or 273 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The square root of 81086850 is about 9004.8237073249. The cubic root of 81086850 is about 432.8294570591.

The spelling of 81086850 in words is "eighty-one million, eighty-six thousand, eight hundred fifty".