81850958 has 24 divisors (see below), whose sum is σ = 142742448. Its totient is φ = 34476192.

The previous prime is 81850957. The next prime is 81850961. The reversal of 81850958 is 85905818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81850957) 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 11 ways as a sum of consecutive naturals, for example, 289085 + ... + 289367.

It is an arithmetic number, because the mean of its divisors is an integer number (5947602).

Almost surely, 2^81850958 is an apocalyptic number.

81850958 is a deficient number, since it is larger than the sum of its proper divisors (60891490).

81850958 is an equidigital number, since it uses as much as digits as its factorization.

81850958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648 (or 365 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 44.

The square root of 81850958 is about 9047.1519275405. The cubic root of 81850958 is about 434.1847734110.

The spelling of 81850958 in words is "eighty-one million, eight hundred fifty thousand, nine hundred fifty-eight".