87127489 has 4 divisors (see below), whose sum is σ = 89482324. Its totient is φ = 84772656.

The previous prime is 87127487. The next prime is 87127517. The reversal of 87127489 is 98472178.

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 53290000 + 33837489 = 7300^2 + 5817^2 .

It is a cyclic number.

It is not a de Polignac number, because 87127489 - 2¹ = 87127487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87127487) 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, 1177362 + ... + 1177435.

It is an arithmetic number, because the mean of its divisors is an integer number (22370581).

Almost surely, 2^87127489 is an apocalyptic number.

It is an amenable number.

87127489 is a deficient number, since it is larger than the sum of its proper divisors (2354835).

87127489 is a wasteful number, since it uses less digits than its factorization.

87127489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2354834.

The product of its digits is 225792, while the sum is 46.

The square root of 87127489 is about 9334.2106790023. The cubic root of 87127489 is about 443.3210970800.

It can be divided in two parts, 87127 and 489, that added together give a square (87616 = 296²).

The spelling of 87127489 in words is "eighty-seven million, one hundred twenty-seven thousand, four hundred eighty-nine".