81987314 has 8 divisors (see below), whose sum is σ = 123717888. Its totient is φ = 40748020.

The previous prime is 81987313. The next prime is 81987319. The reversal of 81987314 is 41378918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×81987314³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (81987313) 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 3 ways as a sum of consecutive naturals, for example, 122402 + ... + 123069.

It is an arithmetic number, because the mean of its divisors is an integer number (15464736).

Almost surely, 2^81987314 is an apocalyptic number.

81987314 is a deficient number, since it is larger than the sum of its proper divisors (41730574).

81987314 is a wasteful number, since it uses less digits than its factorization.

81987314 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245640.

The product of its digits is 48384, while the sum is 41.

The square root of 81987314 is about 9054.6846438736. The cubic root of 81987314 is about 434.4257433189.

The spelling of 81987314 in words is "eighty-one million, nine hundred eighty-seven thousand, three hundred fourteen".