87173217 has 12 divisors (see below), whose sum is σ = 130259220. Its totient is φ = 56111328.

The previous prime is 87173213. The next prime is 87173227. The reversal of 87173217 is 71237178.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 44675856 + 42497361 = 6684^2 + 6519^2 .

It is not a de Polignac number, because 87173217 - 2² = 87173213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87173213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 166738 + ... + 167259.

It is an arithmetic number, because the mean of its divisors is an integer number (10854935).

Almost surely, 2^87173217 is an apocalyptic number.

87173217 is a gapful number since it is divisible by the number (87) formed by its first and last digit.

It is an amenable number.

87173217 is a deficient number, since it is larger than the sum of its proper divisors (43086003).

87173217 is a wasteful number, since it uses less digits than its factorization.

87173217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334032 (or 334029 counting only the distinct ones).

The product of its digits is 16464, while the sum is 36.

The square root of 87173217 is about 9336.6598417207. The cubic root of 87173217 is about 443.3986410784.

It can be divided in two parts, 871 and 73217, that added together give a cube (74088 = 42³).

The spelling of 87173217 in words is "eighty-seven million, one hundred seventy-three thousand, two hundred seventeen".