87012239 has 4 divisors (see below), whose sum is σ = 92130624. Its totient is φ = 81893856.

The previous prime is 87012227. The next prime is 87012241. The reversal of 87012239 is 93221078.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93221078 = 2 ⋅46610539.

It is a cyclic number.

It is not a de Polignac number, because 87012239 - 2⁴ = 87012223 is a prime.

It is a super-2 number, since 2×87012239² = 15142259471586242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87012269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2559167 + ... + 2559200.

It is an arithmetic number, because the mean of its divisors is an integer number (23032656).

Almost surely, 2^87012239 is an apocalyptic number.

87012239 is a deficient number, since it is larger than the sum of its proper divisors (5118385).

87012239 is a wasteful number, since it uses less digits than its factorization.

87012239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5118384.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 87012239 is about 9328.0351092821. The cubic root of 87012239 is about 443.1255395828.

The spelling of 87012239 in words is "eighty-seven million, twelve thousand, two hundred thirty-nine".