87020489 has 4 divisors (see below), whose sum is σ = 87882180. Its totient is φ = 86158800.

The previous prime is 87020473. The next prime is 87020497. The reversal of 87020489 is 98402078.

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 79512889 + 7507600 = 8917^2 + 2740^2 .

It is a cyclic number.

It is not a de Polignac number, because 87020489 - 2⁴ = 87020473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87020429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 430694 + ... + 430895.

It is an arithmetic number, because the mean of its divisors is an integer number (21970545).

Almost surely, 2^87020489 is an apocalyptic number.

It is an amenable number.

87020489 is a deficient number, since it is larger than the sum of its proper divisors (861691).

87020489 is a wasteful number, since it uses less digits than its factorization.

87020489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861690.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 87020489 is about 9328.4773141172. The cubic root of 87020489 is about 443.1395440118.

The spelling of 87020489 in words is "eighty-seven million, twenty thousand, four hundred eighty-nine".