81850384 has 60 divisors (see below), whose sum is σ = 201268368. Its totient is φ = 31886400.

The previous prime is 81850381. The next prime is 81850387. The reversal of 81850384 is 48305818.

It is an interprime number because it is at equal distance from previous prime (81850381) and next prime (81850387).

It is not an unprimeable number, because it can be changed into a prime (81850381) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3879 + ... + 13369.

Almost surely, 2^81850384 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 81850384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100634184).

81850384 is an abundant number, since it is smaller than the sum of its proper divisors (119417984).

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

81850384 is a wasteful number, since it uses less digits than its factorization.

81850384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9524 (or 9511 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 37.

The square root of 81850384 is about 9047.1202047945. The cubic root of 81850384 is about 434.1837584661.

The spelling of 81850384 in words is "eighty-one million, eight hundred fifty thousand, three hundred eighty-four".