87181927994 has 16 divisors (see below), whose sum is σ = 157320772800. Its totient is φ = 35397173664.

The previous prime is 87181927919. The next prime is 87181927999. The reversal of 87181927994 is 49972918178.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 87181927994.

It is not an unprimeable number, because it can be changed into a prime (87181927999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163875539 + ... + 163876070.

It is an arithmetic number, because the mean of its divisors is an integer number (9832548300).

Almost surely, 2^87181927994 is an apocalyptic number.

87181927994 is a deficient number, since it is larger than the sum of its proper divisors (70138844806).

87181927994 is a wasteful number, since it uses less digits than its factorization.

87181927994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327751637.

The product of its digits is 18289152, while the sum is 65.

The spelling of 87181927994 in words is "eighty-seven billion, one hundred eighty-one million, nine hundred twenty-seven thousand, nine hundred ninety-four".