87212009 has 8 divisors (see below), whose sum is σ = 88008960. Its totient is φ = 86418576.

The previous prime is 87211991. The next prime is 87212011. The reversal of 87212009 is 90021278.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87212009 - 2¹⁶ = 87146473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87212809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77519 + ... + 78635.

It is an arithmetic number, because the mean of its divisors is an integer number (11001120).

Almost surely, 2^87212009 is an apocalyptic number.

It is an amenable number.

87212009 is a deficient number, since it is larger than the sum of its proper divisors (796951).

87212009 is a wasteful number, since it uses less digits than its factorization.

87212009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1759.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 87212009 is about 9338.7370131084. The cubic root of 87212009 is about 443.4644019850.

The spelling of 87212009 in words is "eighty-seven million, two hundred twelve thousand, nine".