87171680 has 48 divisors (see below), whose sum is σ = 213055920. Its totient is φ = 33664512.

The previous prime is 87171661. The next prime is 87171691. The reversal of 87171680 is 8617178.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4754 + ... + 14033.

It is an arithmetic number, because the mean of its divisors is an integer number (4438665).

Almost surely, 2^87171680 is an apocalyptic number.

87171680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

87171680 is an abundant number, since it is smaller than the sum of its proper divisors (125884240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87171680 is a wasteful number, since it uses less digits than its factorization.

87171680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18831 (or 18823 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 38.

The square root of 87171680 is about 9336.5775314084. The cubic root of 87171680 is about 443.3960351262.

The spelling of 87171680 in words is "eighty-seven million, one hundred seventy-one thousand, six hundred eighty".