81402014 has 32 divisors (see below), whose sum is σ = 133056000. Its totient is φ = 37233504.

The previous prime is 81401993. The next prime is 81402017. The reversal of 81402014 is 41020418.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81402017) 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, 185207 + ... + 185645.

It is an arithmetic number, because the mean of its divisors is an integer number (4158000).

Almost surely, 2^81402014 is an apocalyptic number.

81402014 is a deficient number, since it is larger than the sum of its proper divisors (51653986).

81402014 is a wasteful number, since it uses less digits than its factorization.

81402014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 81402014 is about 9022.3064678606. The cubic root of 81402014 is about 433.3894981770.

The spelling of 81402014 in words is "eighty-one million, four hundred two thousand, fourteen".