87218979 has 8 divisors (see below), whose sum is σ = 120302160. Its totient is φ = 56140896.

The previous prime is 87218977. The next prime is 87219019. The reversal of 87218979 is 97981278.

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

It is not a de Polignac number, because 87218979 - 2¹ = 87218977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87218977) 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, 501172 + ... + 501345.

It is an arithmetic number, because the mean of its divisors is an integer number (15037770).

Almost surely, 2^87218979 is an apocalyptic number.

87218979 is a deficient number, since it is larger than the sum of its proper divisors (33083181).

87218979 is a wasteful number, since it uses less digits than its factorization.

87218979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1002549.

The product of its digits is 508032, while the sum is 51.

The square root of 87218979 is about 9339.1101824531. The cubic root of 87218979 is about 443.4762155895.

The spelling of 87218979 in words is "eighty-seven million, two hundred eighteen thousand, nine hundred seventy-nine".