87442917729172 has 12 divisors (see below), whose sum is σ = 153025203134356. Its totient is φ = 43721431119360.

The previous prime is 87442917729149. The next prime is 87442917729257. The reversal of 87442917729172 is 27192771924478.

It can be written as a sum of positive squares in 2 ways, for example, as 71116905751056 + 16326011978116 = 8433084^2 + 4040546^2 .

It is a super-2 number, since 2×87442917729172² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1220722 + ... + 13280662.

Almost surely, 2^{87442917729172} is an apocalyptic number.

It is an amenable number.

87442917729172 is a deficient number, since it is larger than the sum of its proper divisors (65582285405184).

87442917729172 is a wasteful number, since it uses less digits than its factorization.

87442917729172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13872618 (or 13872616 counting only the distinct ones).

The product of its digits is 199148544, while the sum is 70.

The spelling of 87442917729172 in words is "eighty-seven trillion, four hundred forty-two billion, nine hundred seventeen million, seven hundred twenty-nine thousand, one hundred seventy-two".