87212217 has 8 divisors (see below), whose sum is σ = 116335296. Its totient is φ = 58115312.

The previous prime is 87212197. The next prime is 87212231. The reversal of 87212217 is 71221278.

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 87212217 - 2¹¹ = 87210169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87212267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3388 + ... + 13634.

It is an arithmetic number, because the mean of its divisors is an integer number (14541912).

Almost surely, 2^87212217 is an apocalyptic number.

It is an amenable number.

87212217 is a deficient number, since it is larger than the sum of its proper divisors (29123079).

87212217 is a wasteful number, since it uses less digits than its factorization.

87212217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13087.

The product of its digits is 3136, while the sum is 30.

The square root of 87212217 is about 9338.7481495113. The cubic root of 87212217 is about 443.4647545378.

The spelling of 87212217 in words is "eighty-seven million, two hundred twelve thousand, two hundred seventeen".