87218871 has 4 divisors (see below), whose sum is σ = 116291832. Its totient is φ = 58145912.

The previous prime is 87218869. The next prime is 87218899. The reversal of 87218871 is 17881278.

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 87218871 - 2¹ = 87218869 is a prime.

It is a congruent 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, 14536476 + ... + 14536481.

It is an arithmetic number, because the mean of its divisors is an integer number (29072958).

Almost surely, 2^87218871 is an apocalyptic number.

87218871 is a deficient number, since it is larger than the sum of its proper divisors (29072961).

87218871 is a wasteful number, since it uses less digits than its factorization.

87218871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29072960.

The product of its digits is 50176, while the sum is 42.

The square root of 87218871 is about 9339.1044003159. The cubic root of 87218871 is about 443.4760325428.

The spelling of 87218871 in words is "eighty-seven million, two hundred eighteen thousand, eight hundred seventy-one".