87828505 has 4 divisors (see below), whose sum is σ = 105394212. Its totient is φ = 70262800.

The previous prime is 87828479. The next prime is 87828509. The reversal of 87828505 is 50582878.

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

It can be written as a sum of positive squares in 2 ways, for example, as 47734281 + 40094224 = 6909^2 + 6332^2 .

It is not a de Polignac number, because 87828505 - 2¹⁵ = 87795737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87828509) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 8782846 + ... + 8782855.

It is an arithmetic number, because the mean of its divisors is an integer number (26348553).

Almost surely, 2^87828505 is an apocalyptic number.

It is an amenable number.

87828505 is a deficient number, since it is larger than the sum of its proper divisors (17565707).

87828505 is a wasteful number, since it uses less digits than its factorization.

87828505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17565706.

The product of its (nonzero) digits is 179200, while the sum is 43.

The square root of 87828505 is about 9371.6863477178. The cubic root of 87828505 is about 444.5068897097.

The spelling of 87828505 in words is "eighty-seven million, eight hundred twenty-eight thousand, five hundred five".