87218705 has 8 divisors (see below), whose sum is σ = 119614272. Its totient is φ = 59807088.

The previous prime is 87218693. The next prime is 87218707. The reversal of 87218705 is 50781278.

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 87218705 - 2¹⁰ = 87217681 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87218707) 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, 1245947 + ... + 1246016.

It is an arithmetic number, because the mean of its divisors is an integer number (14951784).

Almost surely, 2^87218705 is an apocalyptic number.

It is an amenable number.

87218705 is a deficient number, since it is larger than the sum of its proper divisors (32395567).

87218705 is a wasteful number, since it uses less digits than its factorization.

87218705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2491975.

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 87218705 is about 9339.0955129498. The cubic root of 87218705 is about 443.4757511928.

The spelling of 87218705 in words is "eighty-seven million, two hundred eighteen thousand, seven hundred five".