87817720193 has 8 divisors (see below), whose sum is σ = 100365237888. Its totient is φ = 75270734784.

The previous prime is 87817720171. The next prime is 87817720219. The reversal of 87817720193 is 39102771878.

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

It is not a de Polignac number, because 87817720193 - 2⁸ = 87817719937 is a prime.

It is a super-3 number, since 3×87817720193³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87817720153) 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 7 ways as a sum of consecutive naturals, for example, 326105 + ... + 531017.

It is an arithmetic number, because the mean of its divisors is an integer number (12545654736).

Almost surely, 2^87817720193 is an apocalyptic number.

It is an amenable number.

87817720193 is a deficient number, since it is larger than the sum of its proper divisors (12547517695).

87817720193 is a wasteful number, since it uses less digits than its factorization.

87817720193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266143.

The product of its (nonzero) digits is 1185408, while the sum is 53.

The spelling of 87817720193 in words is "eighty-seven billion, eight hundred seventeen million, seven hundred twenty thousand, one hundred ninety-three".