87113218 has 4 divisors (see below), whose sum is σ = 130669830. Its totient is φ = 43556608.

The previous prime is 87113209. The next prime is 87113239. The reversal of 87113218 is 81231178.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 58629649 + 28483569 = 7657^2 + 5337^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 87113218.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21778303 + ... + 21778306.

Almost surely, 2^87113218 is an apocalyptic number.

87113218 is a deficient number, since it is larger than the sum of its proper divisors (43556612).

87113218 is a wasteful number, since it uses less digits than its factorization.

87113218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43556611.

The product of its digits is 2688, while the sum is 31.

The square root of 87113218 is about 9333.4462016985. The cubic root of 87113218 is about 443.2968912451.

The spelling of 87113218 in words is "eighty-seven million, one hundred thirteen thousand, two hundred eighteen".