87128885 has 8 divisors (see below), whose sum is σ = 105097560. Its totient is φ = 69341184.

The previous prime is 87128869. The next prime is 87128887. The reversal of 87128885 is 58882178.

It can be written as a sum of positive squares in 4 ways, for example, as 21696964 + 65431921 = 4658^2 + 8089^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 87128885 - 2⁴ = 87128869 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87128887) 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, 44180 + ... + 46109.

It is an arithmetic number, because the mean of its divisors is an integer number (13137195).

Almost surely, 2^87128885 is an apocalyptic number.

It is an amenable number.

87128885 is a deficient number, since it is larger than the sum of its proper divisors (17968675).

87128885 is a wasteful number, since it uses less digits than its factorization.

87128885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90487.

The product of its digits is 286720, while the sum is 47.

The square root of 87128885 is about 9334.2854573877. The cubic root of 87128885 is about 443.3234647711.

The spelling of 87128885 in words is "eighty-seven million, one hundred twenty-eight thousand, eight hundred eighty-five".