87230581 has 4 divisors (see below), whose sum is σ = 87256332. Its totient is φ = 87204832.

The previous prime is 87230557. The next prime is 87230599. The reversal of 87230581 is 18503278.

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 36108081 + 51122500 = 6009^2 + 7150^2 .

It is a cyclic number.

It is not a de Polignac number, because 87230581 - 2⁹ = 87230069 is a prime.

It is a super-2 number, since 2×87230581² = 15218348523195122, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87230551) 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, 6856 + ... + 14881.

It is an arithmetic number, because the mean of its divisors is an integer number (21814083).

Almost surely, 2^87230581 is an apocalyptic number.

It is an amenable number.

87230581 is a deficient number, since it is larger than the sum of its proper divisors (25751).

87230581 is a wasteful number, since it uses less digits than its factorization.

87230581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25750.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 87230581 is about 9339.7313130518. The cubic root of 87230581 is about 443.4958786758.

The spelling of 87230581 in words is "eighty-seven million, two hundred thirty thousand, five hundred eighty-one".