87900209 has 4 divisors (see below), whose sum is σ = 87919104. Its totient is φ = 87881316.

The previous prime is 87900203. The next prime is 87900223. The reversal of 87900209 is 90200978.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87900209 - 2⁸ = 87899953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87900203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2984 + ... + 13590.

It is an arithmetic number, because the mean of its divisors is an integer number (21979776).

Almost surely, 2^87900209 is an apocalyptic number.

It is an amenable number.

87900209 is a deficient number, since it is larger than the sum of its proper divisors (18895).

87900209 is a wasteful number, since it uses less digits than its factorization.

87900209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18894.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 87900209 is about 9375.5111327330. The cubic root of 87900209 is about 444.6278233108.

The spelling of 87900209 in words is "eighty-seven million, nine hundred thousand, two hundred nine".