87218504 has 8 divisors (see below), whose sum is σ = 163534710. Its totient is φ = 43609248.

The previous prime is 87218501. The next prime is 87218513. The reversal of 87218504 is 40581278.

It can be written as a sum of positive squares in only one way, i.e., 70392100 + 16826404 = 8390^2 + 4102^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (87218501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5451149 + ... + 5451164.

Almost surely, 2^87218504 is an apocalyptic number.

It is an amenable number.

87218504 is a deficient number, since it is larger than the sum of its proper divisors (76316206).

87218504 is a wasteful number, since it uses less digits than its factorization.

87218504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10902319 (or 10902315 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 87218504 is about 9339.0847517302. The cubic root of 87218504 is about 443.4754105217.

The spelling of 87218504 in words is "eighty-seven million, two hundred eighteen thousand, five hundred four".