87316209 has 24 divisors (see below), whose sum is σ = 129523680. Its totient is φ = 56662848.

The previous prime is 87316171. The next prime is 87316213. The reversal of 87316209 is 90261378.

It is not a de Polignac number, because 87316209 - 2⁷ = 87316081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87316279) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52854 + ... + 54480.

It is an arithmetic number, because the mean of its divisors is an integer number (5396820).

Almost surely, 2^87316209 is an apocalyptic number.

87316209 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

It is an amenable number.

87316209 is a deficient number, since it is larger than the sum of its proper divisors (42207471).

87316209 is a wasteful number, since it uses less digits than its factorization.

87316209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1789 (or 1786 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 87316209 is about 9344.3142605544. The cubic root of 87316209 is about 443.6409472417.

The spelling of 87316209 in words is "eighty-seven million, three hundred sixteen thousand, two hundred nine".