81320214 has 32 divisors (see below), whose sum is σ = 173840256. Its totient is φ = 25270400.

The previous prime is 81320189. The next prime is 81320219. The reversal of 81320214 is 41202318.

It is a super-2 number, since 2×81320214² = 13225954410011592, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81320219) 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 15 ways as a sum of consecutive naturals, for example, 7189 + ... + 14639.

It is an arithmetic number, because the mean of its divisors is an integer number (5432508).

Almost surely, 2^81320214 is an apocalyptic number.

81320214 is an abundant number, since it is smaller than the sum of its proper divisors (92520042).

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

81320214 is a wasteful number, since it uses less digits than its factorization.

81320214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7580.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 81320214 is about 9017.7721195426. The cubic root of 81320214 is about 433.2442800565.

The spelling of 81320214 in words is "eighty-one million, three hundred twenty thousand, two hundred fourteen".