87218851 has 4 divisors (see below), whose sum is σ = 87252832. Its totient is φ = 87184872.

The previous prime is 87218839. The next prime is 87218869. The reversal of 87218851 is 15881278.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87218851 - 2⁷ = 87218723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87218821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12795 + ... + 18388.

It is an arithmetic number, because the mean of its divisors is an integer number (21813208).

Almost surely, 2^87218851 is an apocalyptic number.

87218851 is a deficient number, since it is larger than the sum of its proper divisors (33981).

87218851 is a wasteful number, since it uses less digits than its factorization.

87218851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33980.

The product of its digits is 35840, while the sum is 40.

The square root of 87218851 is about 9339.1033295494. The cubic root of 87218851 is about 443.4759986452.

The spelling of 87218851 in words is "eighty-seven million, two hundred eighteen thousand, eight hundred fifty-one".