87128866 has 8 divisors (see below), whose sum is σ = 142574544. Its totient is φ = 39604020.

The previous prime is 87128843. The next prime is 87128869. The reversal of 87128866 is 66882178.

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

It is not an unprimeable number, because it can be changed into a prime (87128869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1980180 + ... + 1980223.

It is an arithmetic number, because the mean of its divisors is an integer number (17821818).

Almost surely, 2^87128866 is an apocalyptic number.

87128866 is a deficient number, since it is larger than the sum of its proper divisors (55445678).

87128866 is a wasteful number, since it uses less digits than its factorization.

87128866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3960416.

The product of its digits is 258048, while the sum is 46.

The square root of 87128866 is about 9334.2844396344. The cubic root of 87128866 is about 443.3234325463.

It can be divided in two parts, 8712 and 8866, that added together give a triangular number (17578 = T₁₈₇).

The spelling of 87128866 in words is "eighty-seven million, one hundred twenty-eight thousand, eight hundred sixty-six".